with of bootstrap modal code example

Example 1: bootstrap modal

<!-- 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">&times;</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>

Example 2: bootstrap modal

<!-- Bootstrap 5 Modal -->
<!-- Button trigger modal -->
<button
   type="button"
   class="btn btn-primary"
   data-bs-toggle="modal"
   data-bs-target="#exampleModal"
>
   Launch demo modal
</button>

<!-- Modal -->
<div
   class="modal fade"
   id="exampleModal"
   tabindex="-1"
   aria-labelledby="exampleModalLabel"
   aria-hidden="true"
>
   <div class="modal-dialog">
      <div class="modal-content">
         <div class="modal-header">
            <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
            <button
               type="button"
               class="btn-close"
               data-bs-dismiss="modal"
               aria-label="Close"
            ></button>
         </div>
         <div class="modal-body">...</div>
         <div class="modal-footer">
            <button
               type="button"
               class="btn btn-secondary"
               data-bs-dismiss="modal"
            >
               Close
            </button>
            <button type="button" class="btn btn-primary">Save changes</button>
         </div>
      </div>
   </div>
</div>