html - How can i make a blur effect on overlay -


i have problem css blur effect on website, because when want set effect on div on page not working correctly , div have blur weird inner shadow effect, picture showing problem:

enter image description here

as see blur effect not working inner glow or shadow in overlay box.

the code:

.overlay__board {    background-color: rgba(0, 0, 0, 0.8);    position: fixed;    z-index: 99;    height: 100%;    width: 100%;    display: block;    top: 0px;    left: 0px;    filter: blur(17px);  }  .follow__board__popup {    width: 791px;    height: 626px;    border: 1px solid #ccc;    position: fixed;    left: 0;    right: 0;    bottom: 0;    top: 0;    margin: auto;    box-sizing: border-box;    border-radius: 5px;    background-color: #fff;    z-index: 9999;  }
<div class="overlay__board"></div>  <div class="follow__board__popup"></div>

https://jsfiddle.net/iklas/dzagx0y5/

the filter: blur() property blurs element applied to. black overlay element trying blur black , result alpha creeping in creating vignette effect.

to blur background elements want apply blur element directly quite pain maintain depending on modularity of overlay pop up.


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