Using Transparency
CSS3 gradients also support transparency, which can be used to create fading effects.To add transparency, we use the rgba() function to define the color stops. The last parameter in the rgba() function can be a value from 0 to 1, and it defines the transparency of the color: 0 indicates full transparency, 1 indicates full color (no transparency).
The following example shows a linear gradient that starts from the left. It starts fully transparent, transitioning to full color red:
Example
A linear gradient from left to right, with transparency:<!DOCTYPE html>
<html>
<head>
<style>
#grad1
{
height:200px;
background: -webkit-linear-gradient(left, rgba(255,0,0,0), rgba(255,0,0,1)); /* For Safari */
background: -o-linear-gradient(right, rgba(255,0,0,0), rgba(255,0,0,1)); /* For Opera 11.1 to 12.0 */
background: -moz-linear-gradient(right, rgba(255,0,0,0), rgba(255,0,0,1)); /* For Firefox 3.6 to 15 */
background: linear-gradient(to right, rgba(255,0,0,0), rgba(255,0,0,1)); /* Standard syntax (must be last) */
}
</style>
</head>
<body>
<h3>Linear Gradient - Transparency</h3>
<p>To add transparency, we use the rgba() function to define the color stops. The last parameter in the rgba() function can be a value from 0 to 1, and it defines the transparency of the color: 0 indicates full transparency, 1 indicates full color (no transparency).</p>
<div id="grad1"></div>
<p><strong>Note:</strong> Internet Explorer 9 and earlier versions do not support gradients.</p>
</body>
</html>
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