CSS rgba() Function

The rgba() function is an inbuilt function in CSS that is used to define the colors using the Red-Green-Blue-Alpha (RGBA) model. It is an extension of rgb() color values containing an alpha channel that specifies the transparency of color.

Syntax:

rgba( red, green, blue, alpha )

Parameters: This function accepts 4 parameters as described below:

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

Example: This example illustrates the rgba() function where different color intensities (ie., red, blue & green), are displayed with the specific value for each color, along with the alpha value for setting the opacity of the color.

HTML

<!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>