center modal in middle of screen code example

Example 1: how to make a modal stay center of screen

//add a  onclick function to your modal button
<button type="button" class="header__button" data-toggle="modal" data-target="#signUpModal" onclick="modalCenter()">
	signup
</button>
//add below function to your scripts
function modalCenter() {
        $('#signUpModal').css({
            'display': 'flex',
            'justify-content': 'center',
            'align-items': 'center'
        })
    }

Example 2: modal center of screen

#signUpModal {
	display: 'flex';
	justify-content: 'center';
	align-items: 'center';
}

Example 3: bootstrap modal center

<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModalCenter">
  Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" 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">
          <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>