<!DOCTYPE html>
<html>
<head>
<style>
/* #RRGGBB */
/* RR (red), GG (green) and BB (blue) */
/* The value is between 00 and FF */
#p1 {background-color:#ff0000;}
#p2 {background-color:#00ff00;}
#p3 {background-color:#0000ff;}
</style>
</head>
<body>
<p>CSS Hexadecimal Colors:</p>
<p id="p1">Red</p>
<p id="p2">Green</p>
<p id="p3">Blue</p>
</body>
</html>