<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="utf-8">
<title>I am the title</title>
<style type="text/css">
p.one { color: rgb(255,255,255); background-color: rgb(255,0,0); }
p.two { background-color: hsl(120,100%,50%); }
p.three { color: rgb(255,255,255); background-color: rgb(0,0,255); }
p.four { color: rgb(255,255,255); background-color: rgba(255,0,0,0.5); }
p.five { background-color: hsla(120,100%,50%,0.5); }
p.six { color: #ffffff; background-color: #0000ff; opacity:0.5;}
</style>
</head>
<body>
<h3>Foreground and background color:</h3>
<p class="one">{ color: rgb(255,255,255); background-color:rgb(255,0,0); }</p>
<p class="two">{ background-color: hsl(120, 100%, 50%); }</p>
<p class="three">{ color: rgb(255,255,255); background-color:rgb(0,0,255); }</p>
<br>
<p class="four">{ color: rgb(255,255,255); background-color:rgba(255,0,0,0.5); }</p>
<p class="five">{ background-color: hsla(120,100%,50%,0.5); }</p>
<p class="six">{ color: #ffffff; background-color:#0000ff; opacity: 0.5; }</p>
</body>
</html>