I have a div
tag with width
set to 800 pixels. When the browser width is greater than 800 pixels, it shouldn't stretch the div
, but it should bring it to the middle of the page.
How to align a to the middle (horizontally/width) of the page
Asked
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Peter Mortensen
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Shimmy Weitzhandler
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1
You can use **flexbox** applying
`display: flex;`
and
`align-items: center; justify-content: center`
– bpardo
Mar 02 '21 at 16:50
27 Answers
1238
<body>
<div style="width:800px; margin:0 auto;">
centered content
</div>
</body>
-
50
This is correct for demo purposes, but obviously not using inline styles in the final markup
– gonzohunter
Jun 05 '09 at 10:36
-
67
Just make sure to apply 'text-align: center' to the or else IE6 will not center the div. Then add text-align: left; to your div.
– avdgaag
Jun 05 '09 at 15:08
-
2
be sure to check HTML mode for IE6 or 7. If you use anything other than **4.01 strict** you may have problems. Most of the time text-align works as avdgaag says.
– bartosz.r
Oct 06 '11 at 10:05
-
1
@rybo111 Then you don't need to. The idea is that 'left' is the default for [text-align](https://developer.mozilla.org/en-US/docs/Web/CSS/text-align), and if it isn't restored then the entire div will inherit 'text-align: center'.
– jkdev
Oct 08 '15 at 23:54
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6
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@themis - I only used 800px because the original question wanted that as the max width.
– AgileJon
Oct 15 '15 at 16:29
-
-
1
not working here too.. it is doing nothing... the text is still on the top of the page... =[
– Luciano Andress Martini
Apr 12 '18 at 13:25
-
Works fine here. I used `max-width` instead of just `width`. Allows it to scale down. "the text is still on the top of the page..." This is not related to *vertical* alignment. It's related to *horizontal* alignment. Also, why are we talking about IE 6-7 in 2011? IE7 was already on its downfall. Why are we talking about IE at all? Do people still use IE these days?
– Jerry Dodge
May 13 '18 at 00:42
-
347
position: absolute
and then top:50%
and left:50%
places the top edge at the vertical center of the screen, and the left edge at the horizontal center, then by adding margin-top
to the negative of the height of the div, i.e., -100 shifts it above by 100 and similarly for margin-left
. This gets the div
exactly in the center of the page.
#outPopUp {
position: absolute;
width: 300px;
height: 200px;
z-index: 15;
top: 50%;
left: 50%;
margin: -100px 0 0 -150px;
background: red;
}
<div id="outPopUp"></div>
Peter Mortensen
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Summo
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16
Thx, your answer is the one and only cross-browser solution, it should be accepted...worth mentioning that it also works with "position:relative" if you have other divs on top and below (in this case only "left:50%" and "margin:0px -150px;" are important).
– Marcus
Nov 22 '13 at 14:51
-
4
position: fixed worked for me and might work best for anyone else where the added div is in some tree of absolute/relative divs already.
– ʍǝɥʇɐɯ
May 28 '14 at 14:04
-
This could be in percentage as well. `width:90%;left:50%;margin-left:45%;`
– iMatoria
Sep 25 '15 at 03:30
-
1
-
7
using ```transform: translateX(-50%)``` is more versatile than using a negative margin as a way to account for the div's width. same applies for translateY and height
– mwag
Dec 07 '17 at 21:39
-
-
@mwag `transform: translate` blurs the content for me. I'm trying to find something alternative for that actually.
– MattSom
Mar 15 '20 at 15:12
-
@MattSom have you tried adjusting anti-aliasing e.g. https://stackoverflow.com/questions/6411361/webkit-based-blurry-distorted-text-post-animation-via-translate3d?
– mwag
Mar 15 '20 at 18:41
-
1
This answer isn't super flexible, bordering on not usable if the dimensions of the div are meant to be dynamic.
– JCollier
Aug 16 '22 at 01:16
175
Flexbox solution is the way to go in/from 2015. justify-content: center
is used for the parent element to align the content to the center of it.
HTML
<div class="container">
<div class="center">Center</div>
</div>
CSS
.container {
display: flex;
justify-content: center;
}
Output
.container {
display: flex;
justify-content: center;
}
.center {
width: 400px;
padding: 10px;
background: #5F85DB;
color: #fff;
font-weight: bold;
font-family: Tahoma;
}
<div class="container">
<div class="center">Centered div with left aligned text.</div>
</div>
m4n0
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3
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1
FYI to align vertically you set `align-items: center`: `justify-content` is for the X axis and `align-items` is the Y.
– Sinjai
Oct 14 '22 at 20:15
67
<div></div>
div {
display: table;
margin-right: auto;
margin-left: auto;
}
Igor Ivancha
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Mohammad
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this is what i needed. thanks. using the more upvoted answers would only help to position a popup. this answer helps position any div in the center horizontally.
– dresh
Jan 05 '17 at 12:48
-
Funny this is the simplest answer and the only one that is actually correct.
Should get more votes.
– A. Kali
Oct 02 '19 at 17:13
-
This CSS has to be the best way to do it. You can set the width 80% here, and then in the inner-div, set it to 100%. And this way, it will scale correctly with the browser resizing. I love it. Thank you very much.
– CodingEE
Apr 27 '20 at 14:51
-
65
Do you mean that you want to center it vertically or horizontally? You said you specified the height
to 800 pixels, and wanted the div not to stretch when the width
was greater than that...
To center horizontally, you can use the margin: auto;
attribute in CSS. Also, you'll have to make sure that the body
and html
elements don't have any margin or padding:
html, body { margin: 0; padding: 0; }
#centeredDiv { margin-right: auto; margin-left: auto; width: 800px; }
Peter Mortensen
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Tomas Aschan
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41
To make it also work correctly in Internet Explorer 6 you have to do it as follows:
HTML
<body>
<div class="centered">
centered content
</div>
</body>
CSS
body {
margin: 0;
padding: 0;
text-align: center; /* !!! */
}
.centered {
margin: 0 auto;
text-align: left;
width: 800px;
}
Peter Mortensen
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Kevin Dungs
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Or go out from quircks mode and use a strict mode, it helps a lot, when you want to use features like hover, auto-margins and many others.
– bartosz.r
Oct 06 '11 at 10:06
35
Div centered vertically and horizontally inside the parent without fixing the content size
Here on this page is a nice overview with several solutions, too much code to share here, but it shows what is possible...
Personally I like this solution with the famous transform translate -50% trick the most. It works well for both fixed (% or px) and undefined height and width of your element.
The code is as simple as:
HTML:
<div class="center"><div>
CSS:
.center {
position: absolute;
left: 50%;
top: 50%;
-moz-transform: translate(-50%, -50%); /* Firefox */
-ms-transform: translate(-50%, -50%); /* IE 9 */
-webkit-transform: translate(-50%, -50%); /* Safari and Chrome*/
-o-transform: translate(-50%, -50%); /* Opera */
transform: translate(-50%, -50%);
/* optional size in px or %: */
width: 100px;
height: 100px;
}
Here a fiddle that shows that it works
Wilt
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The second link is effectively broken (*"This Web page is parked for FREE..."*).
– Peter Mortensen
Mar 24 '19 at 11:07
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@PeterMortensen I improved my answer by replacing the link with a new one with similar solution and by adding the code to the answer to prevent such problems in the future (link only answers are no good). Also removed the link to the first solution because it wasn't that great actually.
– Wilt
Mar 24 '19 at 16:19
-
This worked for me. It also works when you do not specify width of div in css and when you also decide to specify the width in css. Thank you.
– Joseph
Apr 14 '19 at 16:12
-
This solution is easily the best, in my opinion. Why does it have so few votes? The only thing I would change to it is to remove the browser-specific CSS extension declarations: `transform` does the job alone these days.
– JCollier
Aug 16 '22 at 01:12
31
You can also use it like this:
<div style="width: 60%; margin: 0px auto;">
Your contents here...
</div>
Peter Mortensen
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RajeshKdev
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This answer is useful when you don't want to set the width to a fix pixels of 800px. The size can be 80% and it will cover 80% of the screen size available, which seems more dynamic.
– Kamal Soni
Mar 07 '17 at 23:19
23
Simply use the center
tag just after the body
tag, and end the center
tag just before body
ends:
<body>
<center>
... Your code here ...
</center>
</body>
This worked for me with all the browsers I have tried.
Peter Mortensen
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Bharat Chhatre
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44
The `
` tag was [deprecated in html 4](https://developer.mozilla.org/en/HTML/Element/center)
– Manse
May 11 '12 at 10:52
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11
It may have been depreciated, but it's still the simplest solution and works on all browsers.
– Bill Masters
Aug 16 '15 at 02:41
-
@BillMasters May be it is working now but at some time in future it will become obsolete.
– Mohammad Usman
Dec 15 '16 at 07:46
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4
@MohammadUsman I think this tag would survive longer than some fancy ES6 module npm dependency shit.
– est
Aug 30 '17 at 09:02
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1
20
This can be easily achieved via flex container.
.container{
width: 100%;
display: flex;
height: 100vh;
justify-content: center;
}
.item{
align-self: center;
}
Roy
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13
Add this class to the div you want centered (which should have a set width):
.marginAutoLR
{
margin-right:auto;
margin-left:auto;
}
Or, add the margin stuff to your div class, like this:
.divClass
{
width:300px;
margin-right:auto;
margin-left:auto;
}
Taylor Brown
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3
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@ChrisAplin This works for me fine as is. Did you downvote because of this? Not necessary. Someone downvoted this for no apparent reason this is working fine for me I use it everywhere.
– Taylor Brown
Feb 26 '16 at 14:50
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1
12
Use the CSS flex property: http://jsfiddle.net/cytr/j7SEa/6/show/
body { /* Centered */
display: box;
flex-align: center;
flex-pack: center;
}
Peter Mortensen
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7
Some other pre-existing setups from older code that will prevent div page centering L&R are:
- Other classes hidden in external stylesheet links.
- Other classes embedded in something like an
img
(like for older external CSS print format controls).
- Legend code with IDs and/or CLASSES will conflict with a named
div
class.
Peter Mortensen
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Dennis Struck
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6
Centering without specifying div width:
body {
text-align: center;
}
body * {
text-align: initial;
}
body div {
display: inline-block;
}
This is something like <center>
tag does, except:
- all direct inline childs elements (eg.
<h1>
) of <center>
will also positioned to center
- inline-block element can have different size (comapred to
display:block
setting) according to browser defaults
Igor Ivancha
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6
.middle {
margin:0 auto;
text-align: center;
}
/* it brings div to center */
Elvin Jafarov
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KBH
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6
Use the below code for centering the div box:
.box-content{
margin: auto;
top: 0;
right: 0;
bottom: 0;
left: 0;
position: absolute;
width: 800px;
height: 100px;
background-color: green;
}
<div class="box-content">
</div>
Peter Mortensen
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Santosh Khalse
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this worked best for me, easiest and the most straight forward way to align div in center of page
– Vicky Gupta
Mar 06 '21 at 08:43
6
If you have some regular content, and not only one line of text, the only possible reason I know is to calculate margin.
Here is an example:
HTML
<div id="supercontainer">
<div id="middlecontainer">
<div class="common" id="first">first</div>
<div id="container">
<div class="common" id="second">second</div>
<div class="common" id="third">third</div>
</div>
</div>
</div>
CSS
body {
margin: 0;
padding: 0;
}
.common {
border: 1px solid black;
}
#supercontainer {
width: 1200px;
background: aqua;
float: left;
}
#middlecontainer {
float: left;
width: 104px;
margin: 0 549px;
}
#container {
float: left;
}
#first {
background: red;
height: 102px;
width: 50px;
float: left;
}
#second {
background: green;
height: 50px;
width: 50px;
}
#third {
background: yellow;
height: 50px;
width: 50px;
}
So, #supercontainer
is your "whole page"
and its width
is 1200px
.
#middlecontainer
is div
with content of your site; it's width
102px
. In case the width
of content is known, you need to divide the page's size to 2, and subtract half of content's width
from the result:
1200 / 2 - (102 / 2) = 549;
Yes, I'm also seeing that this is der grosse fail of CSS.
Peter Mortensen
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rodnower
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6
parent {
position: relative;
}
child {
position: absolute;
left: 50%;
transform: translateX(-50%);
}
<parent>
<child>
</child>
</parent>
VFDan
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5
body, html {
display: table;
height: 100%;
width: 100%;
}
.container {
display: table-cell;
vertical-align: middle;
}
.container .box {
width: 100px;
height: 100px;
background: red;
margin: 0 auto;
}
"width:100%" for the "body" tag is only for an example. In a real project you may remove this property.
Peter Mortensen
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Andrii Gordiichuk
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5
Use justify-content
and align-items
to horizontally and vertically align a div
https://developer.mozilla.org/de/docs/Web/CSS/justify-content
https://developer.mozilla.org/en/docs/Web/CSS/align-items
html,
body,
.container {
height: 100%;
width: 100%;
}
.container {
display: flex;
align-items: center;
justify-content: center;
}
.mydiv {
width: 80px;
}
<div class="container">
<div class="mydiv">h & v aligned</div>
</div>
toto11
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4
This also works in Internet Explorer, but auto margins do not.
.centered {
position: absolute;
display: inline-block;
left: -500px;
width: 1000px;
margin: 0 50%;
}
Peter Mortensen
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Glen
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I tried it out: http://jsfiddle.net/nqEar/show/
On my monitor (1920px) on Chrome 22 it is not centered.
– surfmuggle
Oct 28 '12 at 07:54
4
Simple http://jsfiddle.net/8pd4qx5r/
html {
display: table;
height: 100%;
width: 100%;
}
body {
display: table-cell;
vertical-align: middle;
}
.content {
margin: 0 auto;
width: 260px;
text-align: center;
background: pink;
}
Igor Ivancha
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2
If your center content is deep inside other divs then only margin can save you. Nothing else. I face it always when not using a framework like Bootstrap.
Peter Mortensen
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Nurul Akter Towhid
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2
In my case, the phone screen size is unknown, and here is what I did.
HTML
<div class="loadingImg"></div>
CSS
.loadingImg{
position: fixed;
top: 0px;
left: 0px;
z-index: 9999999;
border: 0;
background: url('../images/loading.gif') no-repeat center;
background-size: 50px 50px;
display: block;
margin: 0 auto;
-webkit-border-radius: 50px;
border-radius: 50px;
}
JavaScript (before you need to show this DIV)
$(".loadingImg").css("height",$(document).height());
$(".loadingImg").css("width",$(document).width());
$(".loadingImg").show();
Peter Mortensen
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Edye Chan
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1
<body>
<div style=" display: table; margin: 250 auto;">
In center
</div>
</body>
If you want to change the vertical position, change the value of 250 and you can arrange the content as per your need. There is no need to give the width and other parameters.
Peter Mortensen
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Aashutosh Shrivastava
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1
For some reason, none of the previous answers worked for me really. This is what worked for me and it works across browsers as well:
.center {
text-align: center;
height: 100%;
/* Safari, Opera, and Chrome */
display: -webkit-box;
-webkit-box-pack: center;
-webkit-box-align: center;
/* Firefox */
display: -moz-box;
-moz-box-pack: center;
-moz-box-align: center;
/* Internet Explorer 10 */
display: -ms-flexbox;
-ms-flex-pack: center;
-ms-flex-align: center;
}
Peter Mortensen
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Osei-Bonsu Christian
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1
- Get the width of the screen.
- Then make margin left 25%
- Make margin right 25%
In this way the content of your container will sit in the middle.
Example: suppose that container width = 800px;
<div class='container' width='device-width' id='updatedContent'>
<p id='myContent'></p>
<contents></contents>
<contents></contents>
</div>
if ($("#myContent").parent === $("updatedContent"))
{
$("#myContent").css({
'left': '-(device-width/0.25)px';
'right': '-(device-width/0.225)px';
});
}
Peter Mortensen
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Mark Dibeh
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1You can use **flexbox** applying `display: flex;` and `align-items: center; justify-content: center` – bpardo Mar 02 '21 at 16:50
27 Answers
<body>
<div style="width:800px; margin:0 auto;">
centered content
</div>
</body>
-
50This is correct for demo purposes, but obviously not using inline styles in the final markup – gonzohunter Jun 05 '09 at 10:36
-
67Just make sure to apply 'text-align: center' to the or else IE6 will not center the div. Then add text-align: left; to your div. – avdgaag Jun 05 '09 at 15:08
-
2be sure to check HTML mode for IE6 or 7. If you use anything other than **4.01 strict** you may have problems. Most of the time text-align works as avdgaag says. – bartosz.r Oct 06 '11 at 10:05
-
1@rybo111 Then you don't need to. The idea is that 'left' is the default for [text-align](https://developer.mozilla.org/en-US/docs/Web/CSS/text-align), and if it isn't restored then the entire div will inherit 'text-align: center'. – jkdev Oct 08 '15 at 23:54
-
6
-
@themis - I only used 800px because the original question wanted that as the max width. – AgileJon Oct 15 '15 at 16:29
-
-
1not working here too.. it is doing nothing... the text is still on the top of the page... =[ – Luciano Andress Martini Apr 12 '18 at 13:25
-
Works fine here. I used `max-width` instead of just `width`. Allows it to scale down. "the text is still on the top of the page..." This is not related to *vertical* alignment. It's related to *horizontal* alignment. Also, why are we talking about IE 6-7 in 2011? IE7 was already on its downfall. Why are we talking about IE at all? Do people still use IE these days? – Jerry Dodge May 13 '18 at 00:42
-
position: absolute
and then top:50%
and left:50%
places the top edge at the vertical center of the screen, and the left edge at the horizontal center, then by adding margin-top
to the negative of the height of the div, i.e., -100 shifts it above by 100 and similarly for margin-left
. This gets the div
exactly in the center of the page.
#outPopUp {
position: absolute;
width: 300px;
height: 200px;
z-index: 15;
top: 50%;
left: 50%;
margin: -100px 0 0 -150px;
background: red;
}
<div id="outPopUp"></div>

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16Thx, your answer is the one and only cross-browser solution, it should be accepted...worth mentioning that it also works with "position:relative" if you have other divs on top and below (in this case only "left:50%" and "margin:0px -150px;" are important). – Marcus Nov 22 '13 at 14:51
-
4position: fixed worked for me and might work best for anyone else where the added div is in some tree of absolute/relative divs already. – ʍǝɥʇɐɯ May 28 '14 at 14:04
-
This could be in percentage as well. `width:90%;left:50%;margin-left:45%;` – iMatoria Sep 25 '15 at 03:30
-
1
-
7using ```transform: translateX(-50%)``` is more versatile than using a negative margin as a way to account for the div's width. same applies for translateY and height – mwag Dec 07 '17 at 21:39
-
-
@mwag `transform: translate` blurs the content for me. I'm trying to find something alternative for that actually. – MattSom Mar 15 '20 at 15:12
-
@MattSom have you tried adjusting anti-aliasing e.g. https://stackoverflow.com/questions/6411361/webkit-based-blurry-distorted-text-post-animation-via-translate3d? – mwag Mar 15 '20 at 18:41
-
1This answer isn't super flexible, bordering on not usable if the dimensions of the div are meant to be dynamic. – JCollier Aug 16 '22 at 01:16
Flexbox solution is the way to go in/from 2015. justify-content: center
is used for the parent element to align the content to the center of it.
HTML
<div class="container">
<div class="center">Center</div>
</div>
CSS
.container {
display: flex;
justify-content: center;
}
Output
.container {
display: flex;
justify-content: center;
}
.center {
width: 400px;
padding: 10px;
background: #5F85DB;
color: #fff;
font-weight: bold;
font-family: Tahoma;
}
<div class="container">
<div class="center">Centered div with left aligned text.</div>
</div>

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3
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1FYI to align vertically you set `align-items: center`: `justify-content` is for the X axis and `align-items` is the Y. – Sinjai Oct 14 '22 at 20:15
<div></div>
div {
display: table;
margin-right: auto;
margin-left: auto;
}

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3this is what i needed. thanks. using the more upvoted answers would only help to position a popup. this answer helps position any div in the center horizontally. – dresh Jan 05 '17 at 12:48
-
Funny this is the simplest answer and the only one that is actually correct. Should get more votes. – A. Kali Oct 02 '19 at 17:13
-
This CSS has to be the best way to do it. You can set the width 80% here, and then in the inner-div, set it to 100%. And this way, it will scale correctly with the browser resizing. I love it. Thank you very much. – CodingEE Apr 27 '20 at 14:51
-
Do you mean that you want to center it vertically or horizontally? You said you specified the
height
to 800 pixels, and wanted the div not to stretch when thewidth
was greater than that...To center horizontally, you can use the
margin: auto;
attribute in CSS. Also, you'll have to make sure that thebody
andhtml
elements don't have any margin or padding:
html, body { margin: 0; padding: 0; }
#centeredDiv { margin-right: auto; margin-left: auto; width: 800px; }

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To make it also work correctly in Internet Explorer 6 you have to do it as follows:
HTML
<body>
<div class="centered">
centered content
</div>
</body>
CSS
body {
margin: 0;
padding: 0;
text-align: center; /* !!! */
}
.centered {
margin: 0 auto;
text-align: left;
width: 800px;
}

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Or go out from quircks mode and use a strict mode, it helps a lot, when you want to use features like hover, auto-margins and many others. – bartosz.r Oct 06 '11 at 10:06
Div centered vertically and horizontally inside the parent without fixing the content size
Here on this page is a nice overview with several solutions, too much code to share here, but it shows what is possible...
Personally I like this solution with the famous transform translate -50% trick the most. It works well for both fixed (% or px) and undefined height and width of your element.
The code is as simple as:
HTML:
<div class="center"><div>
CSS:
.center {
position: absolute;
left: 50%;
top: 50%;
-moz-transform: translate(-50%, -50%); /* Firefox */
-ms-transform: translate(-50%, -50%); /* IE 9 */
-webkit-transform: translate(-50%, -50%); /* Safari and Chrome*/
-o-transform: translate(-50%, -50%); /* Opera */
transform: translate(-50%, -50%);
/* optional size in px or %: */
width: 100px;
height: 100px;
}
Here a fiddle that shows that it works

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The second link is effectively broken (*"This Web page is parked for FREE..."*). – Peter Mortensen Mar 24 '19 at 11:07
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@PeterMortensen I improved my answer by replacing the link with a new one with similar solution and by adding the code to the answer to prevent such problems in the future (link only answers are no good). Also removed the link to the first solution because it wasn't that great actually. – Wilt Mar 24 '19 at 16:19
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This worked for me. It also works when you do not specify width of div in css and when you also decide to specify the width in css. Thank you. – Joseph Apr 14 '19 at 16:12
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This solution is easily the best, in my opinion. Why does it have so few votes? The only thing I would change to it is to remove the browser-specific CSS extension declarations: `transform` does the job alone these days. – JCollier Aug 16 '22 at 01:12
You can also use it like this:
<div style="width: 60%; margin: 0px auto;">
Your contents here...
</div>

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This answer is useful when you don't want to set the width to a fix pixels of 800px. The size can be 80% and it will cover 80% of the screen size available, which seems more dynamic. – Kamal Soni Mar 07 '17 at 23:19
Simply use the center
tag just after the body
tag, and end the center
tag just before body
ends:
<body>
<center>
... Your code here ...
</center>
</body>
This worked for me with all the browsers I have tried.

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44The `
` tag was [deprecated in html 4](https://developer.mozilla.org/en/HTML/Element/center) – Manse May 11 '12 at 10:52 -
11It may have been depreciated, but it's still the simplest solution and works on all browsers. – Bill Masters Aug 16 '15 at 02:41
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@BillMasters May be it is working now but at some time in future it will become obsolete. – Mohammad Usman Dec 15 '16 at 07:46
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4@MohammadUsman I think this tag would survive longer than some fancy ES6 module npm dependency shit. – est Aug 30 '17 at 09:02
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1
This can be easily achieved via flex container.
.container{
width: 100%;
display: flex;
height: 100vh;
justify-content: center;
}
.item{
align-self: center;
}

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Add this class to the div you want centered (which should have a set width):
.marginAutoLR
{
margin-right:auto;
margin-left:auto;
}
Or, add the margin stuff to your div class, like this:
.divClass
{
width:300px;
margin-right:auto;
margin-left:auto;
}

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3
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@ChrisAplin This works for me fine as is. Did you downvote because of this? Not necessary. Someone downvoted this for no apparent reason this is working fine for me I use it everywhere. – Taylor Brown Feb 26 '16 at 14:50
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1
Use the CSS flex property: http://jsfiddle.net/cytr/j7SEa/6/show/
body { /* Centered */
display: box;
flex-align: center;
flex-pack: center;
}

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Some other pre-existing setups from older code that will prevent div page centering L&R are:
- Other classes hidden in external stylesheet links.
- Other classes embedded in something like an
img
(like for older external CSS print format controls). - Legend code with IDs and/or CLASSES will conflict with a named
div
class.

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Centering without specifying div width:
body {
text-align: center;
}
body * {
text-align: initial;
}
body div {
display: inline-block;
}
This is something like <center>
tag does, except:
- all direct inline childs elements (eg.
<h1>
) of<center>
will also positioned to center - inline-block element can have different size (comapred to
display:block
setting) according to browser defaults

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.middle {
margin:0 auto;
text-align: center;
}
/* it brings div to center */

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Use the below code for centering the div box:
.box-content{
margin: auto;
top: 0;
right: 0;
bottom: 0;
left: 0;
position: absolute;
width: 800px;
height: 100px;
background-color: green;
}
<div class="box-content">
</div>

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this worked best for me, easiest and the most straight forward way to align div in center of page – Vicky Gupta Mar 06 '21 at 08:43
If you have some regular content, and not only one line of text, the only possible reason I know is to calculate margin.
Here is an example:
HTML
<div id="supercontainer">
<div id="middlecontainer">
<div class="common" id="first">first</div>
<div id="container">
<div class="common" id="second">second</div>
<div class="common" id="third">third</div>
</div>
</div>
</div>
CSS
body {
margin: 0;
padding: 0;
}
.common {
border: 1px solid black;
}
#supercontainer {
width: 1200px;
background: aqua;
float: left;
}
#middlecontainer {
float: left;
width: 104px;
margin: 0 549px;
}
#container {
float: left;
}
#first {
background: red;
height: 102px;
width: 50px;
float: left;
}
#second {
background: green;
height: 50px;
width: 50px;
}
#third {
background: yellow;
height: 50px;
width: 50px;
}
So, #supercontainer
is your "whole page"
and its width
is 1200px
.
#middlecontainer
is div
with content of your site; it's width
102px
. In case the width
of content is known, you need to divide the page's size to 2, and subtract half of content's width
from the result:
1200 / 2 - (102 / 2) = 549;
Yes, I'm also seeing that this is der grosse fail of CSS.

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parent {
position: relative;
}
child {
position: absolute;
left: 50%;
transform: translateX(-50%);
}
<parent>
<child>
</child>
</parent>

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body, html {
display: table;
height: 100%;
width: 100%;
}
.container {
display: table-cell;
vertical-align: middle;
}
.container .box {
width: 100px;
height: 100px;
background: red;
margin: 0 auto;
}
"width:100%" for the "body" tag is only for an example. In a real project you may remove this property.

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Use justify-content
and align-items
to horizontally and vertically align a div
https://developer.mozilla.org/de/docs/Web/CSS/justify-content https://developer.mozilla.org/en/docs/Web/CSS/align-items
html,
body,
.container {
height: 100%;
width: 100%;
}
.container {
display: flex;
align-items: center;
justify-content: center;
}
.mydiv {
width: 80px;
}
<div class="container">
<div class="mydiv">h & v aligned</div>
</div>

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This also works in Internet Explorer, but auto margins do not.
.centered {
position: absolute;
display: inline-block;
left: -500px;
width: 1000px;
margin: 0 50%;
}

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I tried it out: http://jsfiddle.net/nqEar/show/ On my monitor (1920px) on Chrome 22 it is not centered. – surfmuggle Oct 28 '12 at 07:54
Simple http://jsfiddle.net/8pd4qx5r/
html {
display: table;
height: 100%;
width: 100%;
}
body {
display: table-cell;
vertical-align: middle;
}
.content {
margin: 0 auto;
width: 260px;
text-align: center;
background: pink;
}

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If your center content is deep inside other divs then only margin can save you. Nothing else. I face it always when not using a framework like Bootstrap.

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In my case, the phone screen size is unknown, and here is what I did.
HTML
<div class="loadingImg"></div>
CSS
.loadingImg{
position: fixed;
top: 0px;
left: 0px;
z-index: 9999999;
border: 0;
background: url('../images/loading.gif') no-repeat center;
background-size: 50px 50px;
display: block;
margin: 0 auto;
-webkit-border-radius: 50px;
border-radius: 50px;
}
JavaScript (before you need to show this DIV)
$(".loadingImg").css("height",$(document).height());
$(".loadingImg").css("width",$(document).width());
$(".loadingImg").show();

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<body>
<div style=" display: table; margin: 250 auto;">
In center
</div>
</body>
If you want to change the vertical position, change the value of 250 and you can arrange the content as per your need. There is no need to give the width and other parameters.

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For some reason, none of the previous answers worked for me really. This is what worked for me and it works across browsers as well:
.center {
text-align: center;
height: 100%;
/* Safari, Opera, and Chrome */
display: -webkit-box;
-webkit-box-pack: center;
-webkit-box-align: center;
/* Firefox */
display: -moz-box;
-moz-box-pack: center;
-moz-box-align: center;
/* Internet Explorer 10 */
display: -ms-flexbox;
-ms-flex-pack: center;
-ms-flex-align: center;
}

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- Get the width of the screen.
- Then make margin left 25%
- Make margin right 25%
In this way the content of your container will sit in the middle.
Example: suppose that container width = 800px;
<div class='container' width='device-width' id='updatedContent'>
<p id='myContent'></p>
<contents></contents>
<contents></contents>
</div>
if ($("#myContent").parent === $("updatedContent"))
{
$("#myContent").css({
'left': '-(device-width/0.25)px';
'right': '-(device-width/0.225)px';
});
}

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