Is it possible to overlay a scrollable form with a white background on top of an existing webpage using PHP and HTML in the same tab?

To overlay a scrollable form with a white background on top of an existing webpage using PHP and HTML in the same tab, you can create a modal popup. This can be achieved by using CSS to style the modal and form, and JavaScript to handle the display and hiding of the modal when triggered. 

<!-- HTML code for modal form -->
<div id="myModal" class="modal">
  <div class="modal-content">
    <form>
      <!-- Form fields go here -->
    </form>
  </div>
</div>

<style>
/* CSS code for modal styling */
.modal {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.4);
}

.modal-content {
  background-color: #fff;
  margin: 15% auto;
  padding: 20px;
  border: 1px solid #888;
  width: 80%;
}

</style>

<script>
// JavaScript code to show/hide the modal
var modal = document.getElementById('myModal');

// Trigger to show the modal
function showModal() {
  modal.style.display = 'block';
}

// Trigger to hide the modal
window.onclick = function(event) {
  if (event.target == modal) {
    modal.style.display = 'none';
  }
}
</script>

Keywords

PHP HTML overlay scrollable form white background

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