css - Blurring background without restructuring html? -

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i trying apply css blur property wrapper div, don't want affect text. framework using difficult restructure html. there way blue background , not text?

html structure

<div class="wrapper"> <h1>hello world</h1> </div>

css

.wrapper{ -webkit-filter: blur(5px); -moz-filter: blur(5px); -o-filter: blur(5px); -ms-filter: blur(5px); filter: blur(5px); background-color:red; }

if point me direction of solution, if there one, appreciated.

it's perhaps worth noting can't blur backgrounds...only elements.

so, pseudo-element answer here.

.wrapper {    position: relative;  }  .wrapper::before {    content: '';    position: absolute;    top: 0;    left: 0;    width: 100%;    height: 100%;    -webkit-filter: blur(5px);    -moz-filter: blur(5px);    -o-filter: blur(5px);    -ms-filter: blur(5px);    filter: blur(5px);    background-color: red;    z-index: -1;  }
<div class="wrapper">    <h1>hello world</h1>  </div>


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