What CSS property disables the activity in the background of a Bootstrap 4 modal?

问题

I would like to know what property, or sets of properties, can be used to deactivate, blur or even put darker the background behind a Bootstrap modal.

I am interested in using those same properties somewhere else but I am having trouble finding them when using inspect element (developer tools).

Hoping you guys can help. Thanks in advance!

回答1:

A div .modal-backdrop is created which is responsible for this... play around to change the color or the opacity of this div

.modal-backdrop {
  background: rgba(161, 247, 174, 0.9) !important;
  opacity: 0.3 !important;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>


<div class="container">
  <h2>Modal Example</h2>
  <!-- Button to Open the Modal -->
  <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
    Open modal
  </button>

  <!-- The Modal -->
  <div class="modal" id="myModal">
    <div class="modal-dialog">
      <div class="modal-content">

        <!-- Modal Header -->
        <div class="modal-header">
          <h4 class="modal-title">Modal Heading</h4>
          <button type="button" class="close" data-dismiss="modal">&times;</button>
        </div>

        <!-- Modal body -->
        <div class="modal-body">
          Modal body..
        </div>

        <!-- Modal footer -->
        <div class="modal-footer">
          <button type="button" class="btn btn-danger" data-dismiss="modal">Close</button>
        </div>

      </div>
    </div>
  </div>

</div>

来源：https://stackoverflow.com/questions/58305525/what-css-property-disables-the-activity-in-the-background-of-a-bootstrap-4-modal