html - How to blur(css) div without blur child element

Question

This question already has answers here:

Answer 1

When using the blur or opacity property, it is not possible to ignore the child element. If you apply either of those properties to parent element, it will automatically apply to child elements too.

There is an alternate solution: create two elements inside your parent div – one div for the background and another div for the contents. Set position:relative on the parent div and set position:absolute; top:0px; right:0px; bottom:0px; left:0px; (or set height/width to 100%) to the child element for the background. Using this method, the content div will not be affected by properties on the background.

Example:

#parent_div {
  position: relative;
  height: 100px;
  width: 100px;
}

#background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: red;
  filter: blur(3px);
  z-index: -1;
}

<div id="parent_div">
  <div id="background"></div>
  <div id="textarea">My Text</div>
</div>