"expand on click"
Bootstrap 4.1.1 Snippet by Reason706

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div id="expand" class="row">
<a href="javascript:void(0)" id="comment-reply">click here</a>
</div>
<div id="nested" class="row m-2 " style="display:none;" >
<h2>This is hidden</h2>
</div>
</div>
<div class="container">
<div id="expand" class="row">
<a href="javascript:void(0)" id="comment-reply">click here</a>
</div>
<div id="nested" class="row m-2 " style="display:none;" >
<h2>This is hidden</h2>
</div>
</div>
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.active{
color:red;
}
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$(function() {
$("a#comment-reply").click(function() {
// remove classes from all
$("div#nested").closest("active");
/* $("a").closest("div").css({
"color": "green",
"border": "2px solid green"
});
*/
/* $("a").closest("div").siblings("#nested").css({
"color": "red",
"border": "2px solid green"
}); */
/* $(this).closest("div").siblings("#nested").css({
"color": "red",
"border": "2px solid green"
});
*/
$("a#comment-reply").closest("div").siblings("#nested").fadeOut();
$(this).closest("div").siblings("#nested").fadeIn();
// add class to the one we clicked
// $("a#comment-reply").fadeOut();
});
});
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