<!-- Collapse buttons -->

  <div>

    <a class="btn btn-primary" data-toggle="collapse" href="#collapseExample" aria-expanded="false"

      aria-controls="collapseExample">

      Link with href

    </a>

    <button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#collapseExample"

      aria-expanded="false" aria-controls="collapseExample">

      Button with data-target

    </button>

  </div>

  <!-- / Collapse buttons -->

​

  <!-- Collapsible element -->

  <div class="collapse" id="collapseExample">

    <div class="mt-3">

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      keffiyeh helvetica,

      craft beer labore wes anderson cred nesciunt sapiente ea proident.

    </div>

  </div>

  <!-- / Collapsible element -->