I'm preparing my site for mobile browsers, so on Chrome Dev Tools i've tested on 320 x 568 size and i've encountered this problem.
My button element is on the bottom of the div, but half of the button is visible, other half is not.
I've tried to style the background (background-size etc) but the changes did not solve the issue.
What's the basic documentation / suggestion to overcome this problem?
Parent Div
<div class="view" id="activeSubstance" data-spy="activeSubstance" data-target="#activeSubstance" style="background-image: url('img/calculate_02.jpg'); background-repeat: no-repeat; background-size: cover; background-position: center center;"></div>
The Child
<div class="row text-center align-items-center mt-3">
<div class="col" id="calculate">
<button type="button" class="btn btn-cyan btn-lg disabled" id="calcButton">Hesaplayalım</button>
</div>
</div>
Full Code
<div class="view" id="activeSubstance" data-spy="activeSubstance" data-target="#activeSubstance" style="background-image: url('img/calculate_02.jpg'); background-repeat: no-repeat; background-size: cover; background-position: center center;">
<!-- Mask & flexbox options-->
<div class="mask rgba-stylish-light align-items-center flex-center">
<!-- Content -->
<div class="container">
<div class="row mt-3">
<!--Dropdown primary-->
<div class="col mt-2">
<!--Dropdown primary-->
<div class="dropdown">
<!--Trigger-->
<a class="btn btn-primary dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown"
aria-haspopup="true" aria-expanded="false" style="display: block">Etken Madde Seçimi</a>
<!--Menu-->
<div class="dropdown-menu dropdown-primary" id="substanceList">
<a class="dropdown-item">Daptomisin - <small>Cubicin</small></a>
<a class="dropdown-item">Ertapenem sodyum - <small>İnvanz</small></a>
<a class="dropdown-item">Flukonazol - <small>Lumen EF</small></a>
<a class="dropdown-item">İmipenem / Silastatin sodyum - <small>Tienam</small></a>
<a class="dropdown-item">Kolistimetat sodyum - <small>Colimycin</small></a>
<a class="dropdown-item">Levofloksasin - <small>Tavanic</small></a>
<a class="dropdown-item">Linezolit - <small>Zyvoxid</small></a>
<a class="dropdown-item">Meropenem trihidrat - <small>Meronem</small></a>
<a class="dropdown-item">Metronidazol - <small>Metronidazol</small></a>
<a class="dropdown-item">Moksifloksasin hidroklorür - <small>Avelox</small></a>
<a class="dropdown-item">Piperasilin sodyum / Tazobaktam sodyum - <small>Tazocin EF</small></a>
<a class="dropdown-item">Sefoperazon sodyum / Sulbaktam sodyum - <small>Sulperazon</small></a>
<a class="dropdown-item">Siprofloksasin laktat - <small>Ciproktan</small></a>
<a class="dropdown-item">Teikoplanin - <small>Targocid</small></a>
<a class="dropdown-item">Tigesiklin - <small>Tygacil</small></a>
<a class="dropdown-item">Vankomisin hidroklorür - <small>Vancotek</small></a>
</div>
</div>
</div>
<!--/Dropdown primary-->
<!--Dropdown primary-->
<div class="col mt-2">
<!--Dropdown primary-->
<div class="dropdown">
<!--Trigger-->
<a class="btn btn-primary dropdown-toggle" type="button" id="dropdownMenu2" data-toggle="dropdown"
aria-haspopup="true" aria-expanded="false" style="display: block">Cockcroft-Gault Denklemi</a>
<!--Menu-->
<div class="dropdown-menu dropdown-info" id="methodlist">
<a class="dropdown-item2" id="willDisable">Cockcroft-Gault Denklemi</a>
<a class="dropdown-item2" id="willDisable2">e-GFR Hesaplayıcısı</a>
</div>
</div>
</div>
<!--/Dropdown primary-->
</div>
<div class="row mt-3">
<div class="col" style="display:none" id="notNeeded">
<p class="note note-info wow fadeIn" id="nonDiyaText">Bu etken madde için böbrek yetmezliği durumunda doz ayarlaması gerekmemektedir.</p>
</div>
</div>
<div class="row text-center align-items-center" id="cockgaulty">
<div class="col-6 col-lg-2">
<select class="browser-default custom-select" id="gender1">
<option selected>Cinsiyet</option>
<option value="1">Erkek</option>
<option value="2">Kadın</option>
</select>
</div>
<div class="col-6 col-lg-2 md-form input-group mb-3">
<input type="number" id="age1" class="form-control" placeholder="Yaş" aria-label="Yaş" aria-describedby="material-addon1" step='1' autocomplete="off" min="0">
</div>
<div class="col-6 col-lg-2 md-form input-group mb-3">
<input type="number" id="srcr1" class="form-control" placeholder="Serum kreatinini" aria-label="Serum kreatinini" aria-describedby="material-addon1" step='0.01' autocomplete="off" min="0">
</div>
<div class="col-6 col-lg-2">
<select class="browser-default custom-select" id="crunit1">
<option selected value="1">mg/dL</option>
<option value="2">µmol/L</option>
</select>
</div>
<div class="col-6 col-lg-2 md-form input-group mb-3">
<input type="number" id="weight" class="form-control" placeholder="Ağırlık" aria-label="Ağırlık" aria-describedby="material-addon1" step='0.5' autocomplete="off" min="0">
</div>
<div class="col-6 col-lg-2 custom-control custom-checkbox mt-3" id="diya1" style="padding-left: 2.5rem;">
<input type="checkbox" class="custom-control-input" id="diyaliz1">
<label class="custom-control-label" id="dia1" for="diyaliz1">Hemodiyaliz Alıyor</label>
</div>
</div>
<div class="row text-center align-items-center" style="display:none" id="egfry">
<div class="col-6 col-lg-2">
<select class="browser-default custom-select" id="gender2">
<option selected>Cinsiyet</option>
<option value="1">Erkek</option>
<option value="2">Kadın</option>
</select>
</div>
<div class="col-6 col-lg-1 md-form input-group mb-3">
<input type="number" id="age2" class="form-control" placeholder="Yaş" aria-label="Yaş" aria-describedby="material-addon1" step='1' autocomplete="off" min="0">
</div>
<div class="col-6 col-lg-2 md-form input-group mb-3">
<input type="number" id="srcr2" class="form-control" placeholder="Serum kreatinini" aria-label="Serum kreatinini" aria-describedby="material-addon1" step='0.01' autocomplete="off" min="0">
</div>
<div class="col-6 col-lg-1">
<select class="browser-default custom-select" id="crunit2">
<option selected value="1">mg/dL</option>
<option value="2">µmol/L</option>
</select>
</div>
<div class="col-6 col-lg-1 md-form input-group mb-3">
<input type="number" id="nitrog" class="form-control" placeholder="BUN" aria-label="BUN" aria-describedby="material-addon1" step='0.01' autocomplete="off" min="0">
</div>
<div class="col-6 col-lg-2 md-form input-group mb-3">
<input type="number" id="albumin" class="form-control" placeholder="Albumin" aria-label="Albumin" aria-describedby="material-addon1" step='0.01' autocomplete="off" min="0">
</div>
<div class="col-6 col-lg-1 custom-control custom-checkbox mt-2">
<input type="checkbox" class="custom-control-input" id="black">
<label class="custom-control-label" for="black">Siyahi</label>
</div>
<div class="col-6 col-lg-2 custom-control custom-checkbox mt-2" id="diya2">
<input type="checkbox" class="custom-control-input" id="diyaliz2">
<label class="custom-control-label" id="dia2" for="diyaliz2">Hemodiyaliz Alıyor</label>
</div>
</div>
<div class="row mt-3">
<div class="col" id="infoDiv">
<p class="note note-info wow fadeIn" id="infoText"><strong>Cockcroft-Gault Denklemi </strong>ile hesaplama yaparken cinsiyet, yaş, ağırlık ve serum kreatinini değerlerini girmeniz gerekir.</p>
</div>
</div>
<div class="row text-center align-items-center mt-3">
<div class="col" id="calculate">
<button type="button" class="btn btn-cyan btn-lg disabled" id="calcButton">Hesaplayalım</button>
</div>
</div>
<!-- /Content -->
</div>
</div>
Problem Causing "view" class CSS
.view {
position: relative;
overflow: hidden;
cursor: default; }
.view .mask {
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
overflow: hidden;
width: 100%;
height: 100%;
background-attachment: fixed; }
.view img, .view video {
position: relative;
display: block; }
.view video.video-intro {
z-index: -100;
top: 50%;
left: 50%;
-webkit-transform: translateX(-50%) translateY(-50%);
-ms-transform: translateX(-50%) translateY(-50%);
transform: translateX(-50%) translateY(-50%);
-webkit-transition: 1s opacity;
-o-transition: 1s opacity;
transition: 1s opacity;
min-width: 100%;
min-height: 100%;
width: auto;
height: auto; }
PS: As you can see in the screenshot, "The end of the div" i've mentioned is not the end of the page, instead another DIV starts. But my button overflowed from the div above and only half of it is visible