Modal

<div class="modal" tabindex="-1" role="dialog">  <div class="modal-dialog" role="document">    <div class="modal-content">      <div class="modal-header">        <h5 class="modal-title">Modal title</h5>        <button type="button" class="close" data-dismiss="modal" aria-label="Close">          <span aria-hidden="true">×</span>        </button>      </div>      <div class="modal-body">        <p>Modal body text goes here.</p>      </div>      <div class="modal-footer">        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>        <button type="button" class="btn btn-primary">Save changes</button>      </div>    </div>  </div></div>
Live Demo
<button type="button" class="btn btn-primary mr-2 mb-2" data-toggle="modal" data-target="#exampleModal">  Launch demo modal</button><div class="modal" tabindex="-1" role="dialog" id="exampleModal">  <div class="modal-dialog" role="document">    <div class="modal-content">      <div class="modal-header">        <h5 class="modal-title">Modal title</h5>        <button type="button" class="close" data-dismiss="modal" aria-label="Close">          <span aria-hidden="true">×</span>        </button>      </div>      <div class="modal-body">        <p>Modal body text goes here.</p>      </div>      <div class="modal-footer">        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>        <button type="button" class="btn btn-primary">Save changes</button>      </div>    </div>  </div></div>
Scrolling long content
<div class="modal" tabindex="-1" role="dialog">  <div class="modal-dialog" role="document">    <div class="modal-content">      <div class="modal-header">        <h5 class="modal-title">Modal title</h5>        <button type="button" class="close" data-dismiss="modal" aria-label="Close">          <span aria-hidden="true">×</span>        </button>      </div>      <div class="modal-body">        ...      </div>      <div class="modal-footer">        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>        <button type="button" class="btn btn-primary">Save changes</button>      </div>    </div>  </div></div>
Vertically centered
<div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-hidden="true">  <div class="modal-dialog modal-dialog-centered" role="document">    <div class="modal-content">      <div class="modal-header">        <h5 class="modal-title" id="exampleModalCenterTitle">Modal title</h5>        <button type="button" class="close" data-dismiss="modal" aria-label="Close">          <i class="ti-close"></i>        </button>      </div>      <div class="modal-body">        ...      </div>      <div class="modal-footer">        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close        </button>        <button type="button" class="btn btn-primary">Save changes</button>      </div>    </div>  </div></div>
Optional sizes
<!-- .modal-xl --><div class="modal fade" tabindex="-1" role="dialog" aria-hidden="true">  <div class="modal-dialog modal-xl">    <div class="modal-content">      <div class="modal-header">        <h6 class="modal-title">Extra large modal</h6>        <button type="button" class="close" data-dismiss="modal" aria-label="Close">          <i class="ti-close"></i>        </button>      </div>      <div class="modal-body">        ...      </div>      <div class="modal-footer">        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close        </button>        <button type="button" class="btn btn-primary">Save changes</button>      </div>    </div>  </div></div><!-- .modal-lg --><div class="modal fade" tabindex="-1" role="dialog" aria-hidden="true">  <div class="modal-dialog modal-lg">    <div class="modal-content">      <div class="modal-header">        <h6 class="modal-title">Large modal</h6>        <button type="button" class="close" data-dismiss="modal" aria-label="Close">          <i class="ti-close"></i>        </button>      </div>      <div class="modal-body">        ...      </div>      <div class="modal-footer">        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close        </button>        <button type="button" class="btn btn-primary">Save changes</button>      </div>    </div>  </div></div><!-- .modal-sm --><div class="modal fade" tabindex="-1" role="dialog" aria-hidden="true">  <div class="modal-dialog modal-sm">    <div class="modal-content">      <div class="modal-header">        <h6 class="modal-title">Small modal</h6>        <button type="button" class="close" data-dismiss="modal" aria-label="Close">          <i class="ti-close"></i>        </button>      </div>      <div class="modal-body">        ...      </div>      <div class="modal-footer">        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close        </button>        <button type="button" class="btn btn-primary">Save changes</button>      </div>    </div>  </div></div>
Varying modal content
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal" data-whatever="@mdo">  Open modal for @mdo</button><button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal" data-whatever="@fat">  Open modal for @fat</button><button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal" data-whatever="@getbootstrap">Open modal for  @getbootstrap</button><!-- modal --><div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-hidden="true">  <div class="modal-dialog" role="document">    <div class="modal-content">      <div class="modal-header">        <h5 class="modal-title" id="exampleModalLabel">New message</h5>        <button type="button" class="close" data-dismiss="modal" aria-label="Close">          <i class="ti-close"></i>        </button>      </div>      <div class="modal-body">        <form>          <div class="form-group">            <label for="recipient-name" class="col-form-label">Recipient:</label>            <input type="text" class="form-control" id="recipient-name">          </div>          <div class="form-group">              <label for="message-text" class="col-form-label">Message:</label>              <textarea class="form-control" id="message-text"></textarea>            </div>         </form>       </div>       <div class="modal-footer">          <button type="button" class="btn btn-secondary" data-dismiss="modal">Close          </button>          <button type="button" class="btn btn-primary">Send message</button>       </div>     </div>  </div></div>