Cannot get blurry background when Bootstrap modal is opened-CodePudding

I am using Bootstrap 5.1.3 and I would like to blur the background when a modal opens with the CSS backdrop-filter property.

The simplest approach I tried is:

.modal-backdrop {
  backdrop-filter: blur(5px);
}

Live demo here: https://codepen.io/kikosoft/pen/YzjxOQm

I am using the latest Firefox browser, but the results are the same in Chrome (Windows 11).

I tried many variants suggested everywhere, but none of them work. The background simply never gets blurred. Can anybody get the background to blur with backdrop-filter? What am I missing here?

CodePudding user response：

You need to change in CSS and HTML structure according below code.

Using backdrop-filter

.modal-open .modal-backdrop {
  backdrop-filter: blur(5px);
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 1 !important;
}

<script src="//cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js"></script>
<link href="//cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet"/>
<h1>This text should get blurred when the modal is opened.</h1>

<!-- Button trigger modal -->
<button type="button"  data-bs-toggle="modal" data-bs-target="#exampleModal">
  Launch demo modal
</button>

<!-- Modal -->
<div  id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div >
    <div >
      <div >
        <h5  id="exampleModalLabel">Modal title</h5>
        <button type="button"  data-bs-dismiss="modal" aria-label="Close"></button>
      </div>
      <div >
        ...
      </div>
      <div >
        <button type="button"  data-bs-dismiss="modal">Close</button>
        <button type="button" >Save changes</button>
      </div>
    </div>
  </div>
</div>

Using filter

.modal-open .main-wrapper {
  filter: blur(5px);
}

<script src="//cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js"></script>
<link href="//cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet"/>
<div >
<h1>This text should get blurred when the modal is opened.</h1>

<!-- Button trigger modal -->
<button type="button"  data-bs-toggle="modal" data-bs-target="#exampleModal">
  Launch demo modal
</button>
</div>

<!-- Modal -->
<div  id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div >
    <div >
      <div >
        <h5  id="exampleModalLabel">Modal title</h5>
        <button type="button"  data-bs-dismiss="modal" aria-label="Close"></button>
      </div>
      <div >
        ...
      </div>
      <div >
        <button type="button"  data-bs-dismiss="modal">Close</button>
        <button type="button" >Save changes</button>
      </div>
    </div>
  </div>
</div>

CodePudding user response：

i dont have enough rep for comment so i write my answer here:

you should apply your style to #exampleModal

#exampleModal {
  backdrop-filter: blur(5px);
}