<![CDATA[<!DOCTYPE html>
<html>
<head>
<meta charset = "utf-8">
<title>Color</title>
</head>
<body>
<-- background has no opacity ->
<div style= "background: rgba(50, 50, 50);">
<p style = "color: red;">color: red</p>
<p style = "color: #FF0000;">color: #FF0000</p>
</div>
<-- background has 50% opacity ->
<div style= "background: rgba(50, 50, 50, 0.5);">
<p style = "color: blue;">color: blue</p>
<p style = "color: #0000FF;">color: #0000FF</p>
</div>
</body>
</html>
]]>