4.fixed_pos.html

<!DOCTYPE html>
<html>
<head>
	<title>Fixed Positioning</title>
	<style>

	/* Fixed positioning can be used to keep something on a certain area of the screen even while scrolling. It is easier to understand this one by seeing it in action so take a look at the example below in a browser. */

		#red_box { 
			position: absolute;
		 	top: 0;
		 	left: 50%;
		 	width: 200px;
		 	height: 200px;
			background: #ee3e64;
		}
		#blue_box { 
			position: fixed;  /* fixed 200px from the top and 50% from the left. */
		 	top: 200px;
		 	left: 50%;
		 	width: 200px;
		 	height: 200px;
			background: #44accf;
		}
		#green_box { 
			position: absolute;
		 	top: 5000px;
		 	left: 50%;
		 	width: 200px;
		 	height: 200px;
			background: #b7d84b;
		}
	</style>
</head>
<body>
	<div id="red_box">Absolute</div>
	<div id="blue_box">Fixed</div>
	<div id="green_box">Absolute</div>
</body>
</html>