How Can I Blur a Div's Background Without Blurring Its Child Elements?

Blurring a Div without Affecting Child Elements: A Guide

Often, when applying a blur to a div, users encounter the challenge of unintentionally blurring child elements as well. To address this issue, it's important to understand the limitations of blur and opacity properties in CSS. By default, these properties affect both the parent and child elements within.

Alternative Solution: Separating Content and Background

To avoid blurring child elements, a viable solution is to create two separate elements within the parent div: one for the background and another for the content.

Implementation:

1. Set the parent div's position to "relative."
2. Create a child element for the background and set its position to "absolute," with top, right, bottom, and left values of 0 (or set its height and width to 100%).
3. Apply the blur or opacity property to the background child element.

By isolating the background in this manner, the content child element will not be affected by the blur or opacity applied to the parent div.

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;
}

#content {
  /* Content properties here */
}

<div>

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