CSS Introduction

Convert Hex to RGBa for background opacity using SASS

Last Updated : 15 Jul, 2025

Sass rgba function uses Red-green-blue-alpha model to describe colours where alpha is used to add opacity to the color. It's value ranges between 0.0 (completely transparent) to 1.0 (completely opaque). The function takes two input values- the hex color code and alpha and converts Hex code to RGBa format.

Syntax:

Using background-color property:

element {
    background-color: rgba(hex_value, opacity_value);
}

Using mixins with background-color property that provides hex fallback:

@mixin background-opacity($color, $opacity) {
    background: $color;  /*Fallback */
    background: rgba($color, $opacity);
}

body {
     @include background-opacity(hex_value, opacity_value);
}

Below examples illustrate the above approach:

Example 1: Adding 70% opacity to a Hex code

html

<!DOCTYPE html>
<html>
<head>
<title>Converting Hex to RGBA for background opacity</title>
</head>
<body>
  <p>GeeksforGeeks</p>
</body>
</html>

SASS code:

css

@mixin background-opacity($color, $opacity) {
    background: $color;
    background: rgba($color, $opacity);
}

body {
     @include background-opacity(#32DF07, 0.7);
}

Converted CSS code:

body {
  background: #32DF07;
  background: rgba(50, 223, 7, 0.7);
}

Output:

Background Color with 70% opacity

Example 2: Adding 50% opacity to a Hex code

html

<!DOCTYPE html>
    <html>
     <head>
       <title>
Converting Hex to RGBA for background opacity
       </title>
     </head>
<body>
  <p>GeeksforGeeks</p>
</body>
</html>

SASS code:

html

@mixin background-opacity($color, $opacity) {
    background: $color;
    background: rgba($color, $opacity);
}

body {
     @include background-opacity(#32DF07, 0.5);
}

Converted CSS code:

body {
  background: #32DF07;
  background: rgba(50, 223, 7, 0.5);
}

Output:

Background Color with 50% opacity

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