CSS | rgba() Function

The rgba() function is an inbuilt function in CSS which is used to define the colors using the Red-Green-Blue-Alpha (RGBA) model.

Syntax:

rgba( red, green, blue, alpha )

Parameters: This function accepts four parameters as mentioned above and described below:

  • red: This parameter is used to define the intensity of red color. Its is an integer value lies between 0 to 255, or as a percentage value between 0% to 100%.
  • green: This parameter is used to define the intensity of green color. Its is an integer value lies between 0 to 255, or as a percentage value between 0% to 100%.
  • blue: This parameter is used to define the intensity of blue color. Its is an integer value lies between 0 to 255, or as a percentage value between 0% to 100%.
  • alpha: This parameter is used to defines the opacity and the value lies between 0.0 (fully transparent) to 1.0 (fully opaque).

Below program illustrates the rgba() function in CSS:

Program:

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<!DOCTYPE html>
<html>
    <head>
        <title>rgba function</title>
        <style
            .gfg1 {
                background-color:rgba(1, 153, 0, 0.5);
                text-align:center;
            }
            .gfg2 {
                background-color:rgba(0, 255, 0, 0.5);
                text-align:center
            }
            .gfg3 {
                background-color:rgba(133, 150, 150, 0.5);
                text-align:center
            }
            .gfg {
                font-size:40px;
                font-weight:bold;
                color:green;
                text-align:center;
            }
            h1 {
                text-align:center;
            }
        </style>
    </head>
    <body>
        <div class = "gfg">GeeksforGeeks</div>
        <h1>The rgba() Function</h1>
        <p class = "gfg1">Green</p>
        <p class = "gfg2">Light green</p>
        <p class = "gfg3">Light black</p>
    </body>
</html>                    

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Output:

Supported Browsers: The browser supported by rgb() function are listed below:

  • Chrome 1.0 and above
  • Internet Explorer 9.0 and above
  • Firefox 3.0 and above
  • Safari 3.1 and above
  • Opera 10.0 and above


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