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CSS | opacity() Function

  • Last Updated : 08 Aug, 2019

The opacity() function is an inbuilt function which is used to apply a filter to the image to set the transparency of the image.

Syntax:

opacity( amount )

Parameters: This function accepts single parameter amount which holds the amount of transparency. The value of opacity is set in terms of number and percentage. The value 0% represents the complete transparent image and 100% represents the original image.

Below example illustrates the opacity() function in CSS:

Example:




<!DOCTYPE html> 
<html
  
<head
    <title>CSS opacity() Function</title
      
    <style>
        h1 {
            color:green;
        }
        body {
            text-align:center;
        }
        .opacity_effect {
            filter: opacity(30%);
        }
    </style>
</head
  
<body
    <h1>GeeksforGeeks</h1
      
    <h2>CSS opacity() function</h2>
      
    <img class="opacity_effect" src
        alt="GeeksforGeeks logo"
</body
  
</html>

Output:

Supported Browsers: The browsers supported by opacity() function are listed below:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Safari
  • Opera
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