Это происходит из-за того, что Bootstrap применяет нежелательные css (только в нашем случае) для modal class ...
.modal {
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
z-index: 1050;
display: none;
overflow: hidden;
outline: 0;
}
В приведенном выше css .modal есть top:0; bottom:0; right:0; left:0;. в этом случае модал займет 100% height и width. поэтому мы просто перезаписываем top и left на auto, как показано ниже ...
$('#storyGate').css({'top':'auto', 'left':'auto'});
Мы можем решить эту проблему также с помощью css ...
.modal{
top:auto !important;
left:auto !important;
}
jQuery(document).ready(function($) {
$('#storyGate').modal({backdrop: false});
$('#storyGate').on('shown.bs.modal', function (e) {
$("body").removeClass("modal-open");
});
$('#storyGate').css({'top':'auto', 'left':'auto'});
});
/* Story Gate Styles */
#storyGate .modal-dialog {
max-width: 100%;
margin-top: 0;
}
#storyGate .modal-content {
border: 0;
border-radius: 0;
background: #ca2742;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<!-- Modal -->
<div class="modal fade m-0" id="storyGate" tabindex="-1" role="dialog" aria-labelledby="shareStoryLabel" aria-hidden="true">
<div class="modal-dialog fixed-bottom w-100 m-0" role="document">
<div class="modal-content">
<div class="modal-body p-2">
<div class="d-flex justify-content-between align-items-center">
<p class="m-0 text-white">Have you ever eaten ice cream?</p>
<div class="buttons d-flex flex-column flex-sm-row pr-4">
<a href="#!yes" role="button" class="btn btn-light mr-md-2 my-2">Yes</a>
<a href="#!no" role="button" class="btn btn-outline-light close-modal my-2 mr-0" data-dismiss="modal">No</a>
</div>
</div>
</div>
</div>
</div>
</div>
<h1>HTML Ipsum Presents</h1>
<p><strong>Pellentesque</strong> <a href="http://stackoverflow.com">why can't I click this</a> et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. <em>Aenean ultricies mi vitae est.</em> Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, <code>commodo vitae</code>, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui. <a href="#">Donec non enim</a> in turpis pulvinar facilisis. Ut felis.</p>
<p><strong>Pellentesque habitant morbi tristique</strong> senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. <em>Aenean ultricies mi vitae est.</em> Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, <code>commodo vitae</code>, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui. <a href="#">Donec non enim</a> in turpis pulvinar facilisis. Ut felis.</p>
<h2>Header Level 2</h2>
<ol>
<li>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</li>
<li>Aliquam tincidunt mauris eu risus.</li>
</ol>
<blockquote><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus magna. Cras in mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa. Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus turpis elit sit amet quam. Vivamus pretium ornare est.</p></blockquote>
<h3>Header Level 3</h3>
<ul>
<li>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</li>
<li>Aliquam tincidunt mauris eu risus.</li>
</ul>
<pre><code>
#header h1 a {
display: block;
width: 300px;
height: 80px;
}
HTML Ipsum Presents
Пеллетентный обитатель морби тристик senectus et netus et malesuada Fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Anean ultricies mi vitae est. Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui. Donec non enim in turpis pulvinar facilisis. Ut felis.
Пеллетентный житель Морби Тристик Senectus et netus и malesuada Fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Anean ultricies mi vitae est. Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui. Donec non enim in turpis pulvinar facilisis. Ut felis.