CSS IDs

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IDs are similar to
classes, except once a specific id has been declared it
cannot be used again within the same (X)HTML file.

				
					<div id="container">
 Everything within my document is inside this division.
 </div>

				
					#container{ 
width: 80%;
 margin: auto;
 padding: 20px;
 border: 1px solid #666;
 background: #ffffff;
 }

You will notice that the id selector begins with a (#) number sign instead
of a (.) period, as the class selector does.