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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="/lib/bootstrap.min.css"> <script src="/lib/jquery-1.12.2.min.js"></script> <script src="/lib/bootstrap.min.js"></script> <style> .collapsing { background-color: yellow; } </style> </head> <body> <div class="container"> <h2>Simple Collapsible</h2> <button type="button" class="btn btn-lg btn-info collapsed" data-toggle="collapse" data-target="#demo">Simple collapsible</button> <div id="demo" class="collapse"> The .collapsing class is added when the transition starts, and removed when it is finished. In this example, the collapsible content gets a yellow background for those seconds it takes to show the content. The background color is removed when the transition has ended. </div> </div> </body> </html>