1

I have a page with a banner and 3 columns, and I am trying to make it so that when the screen width gets too small, that the first 2 columns change from 1/3rd width to 50% width and the last column width change to 100% so that it's below the first two.

When I do this, the height of the columns does change (they change to 50%, considering the columns will now fit underneath each other inside a 100% row), but the width does not. How could I fix this? Thanks in advance!

Codepen

HTML

<section class="section">
  <div class="container-fluid">
    <div class="aboutBanner"> </div>

    <div class="row">
      <div class="col">

      </div>
      <div class="col">

      </div>
      <div class="col">

      </div>
    </div>
  </div>
</section>

related CSS

.aboutBanner {
    height: 30%;
    border: 1px solid blue;
}

.row {
    height: 70%;
}

.row .col {
    height: 100%;
    border: 1px solid red;
}

@media screen and (max-width: 768px){
    .row .col:nth-of-type(1),
    .row .col:nth-of-type(2) {
        height: 50%;
        width: 50%;
    }
    .row .col:nth-of-type(3) {
        height: 50%;
        width: 100%;
        border-style: dashed;
    }
}
Jos van Weesel
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2 Answers2

2

Use the Bootstrap responsive grid columns...

https://codepen.io/anon/pen/eMzRyb

<section class="section">
  <div class="container-fluid">
    <div class="aboutBanner">

    </div>
    <div class="row">
      <div class="col-sm-4 col-6">

      </div>
      <div class="col-sm-4 col-6">

      </div>
      <div class="col-sm-4 col-12">

      </div>
    </div>
  </div>
</section>

To visualize this in your codepen I changed the CSS...

.row {
    height: 70%;
}

.row > div {
    border: 1px solid red;
}

Also see: What is the difference among col-lg-*, col-md-* and col-sm-* in Bootstrap?

Carol Skelly
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1

Use bootstrap col-[size] class

See documentation

The bootstrap grid is based in 12 columns sizes, that are divided in 5 screen sizes:

  • Extra small
    • col-[1 to 12]
  • Small
    • col-sm-[1 to 12]
  • Medium
    • col-md-[1 to 12]
  • Large
    • col-lg-[1 to 12]
  • Extra large
    • col-xl-[1 to 12]

Try this:

<section class="section">
  <div class="container-fluid">
    <div class="aboutBanner"> </div>

    <div class="row">
      <div class="col-md-4 col-sm-6">
          content of first
      </div>
      <div class="col-md-4 col-sm-6">
          content of second
      </div>
      <div class="col-md-4 col-sm-12">
          content of third
      </div>
    </div>
  </div>
</section>

Keep in mind that 12 is 100%, 6 is 50%, 4 is 33%, 3 is 25% and so on...

Community
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  • 1
Claudio Nastasi Junior
  • 141
  • 9
  • `col` is a valid Bootstrap class. Having 3 col's basically means they are all equal width. I just found it strange that I couldn't overwrite the width with a media query. The reason I want to use a media query for this is so I can set my own width instead of relying on Bootstrap's predefined width. – Jos van Weesel Mar 16 '18 at 16:00