To set the opacity for the background color, use the opacity property with RGBA color values.
Example
You can try to run the following code to implement the opacity property:
<!DOCTYPE html>
<html>
<head>
<style>
div {
background: rgb(40, 135, 70);
padding: 20px;
}
div.first {
background: rgba(40, 135, 70, 0.2);
}
div.second {
background: rgba(40, 135, 70, 0.6);
}
</style>
</head>
<body>
<p>RGBA color values</p>
<div class = "first"><p>20% opacity</p></div>
<div class = "second"><p>60% opacity</p></div>
<div><p>Default Opacity</p></div>
</body>
</html>