CSS Lengths
A length in CSS is defined by concatenating the number of units and the unit identifier together. For example, 5cm means 5 cm (centimeters). 20pt means 20 pt (points).
CSS defines two kinds of length unit:
<!DOCTYPE HTML>
<html>
<head>
<title>Example</title>
<style type="text/css">
p {
background: grey;
color:white;
width: 5cm;
font-size: 20pt;
}
</style>
</head>
<body>
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<p>I like <span>HTML</span> and CSS.</p>
<a class="myclass1 myclass2" href="http://java2s.com">Visit the website</a>
</body>
</html>