The first definition in the basic.css file refers to style that will be applied to the body area (the whole screen) of the HTML pages that are linked to it:

body {  
	background: #FFFFFF;  
	color: #000000; 
	margin: 0%; 
	}  

Each definition ends with a semi-colon, and all definitions are grouped in curly brackets, { } -- the colors are in hex and can be any properly contrasting colors.

Note that "background" is the background color, and "color" is the text color that will be applied to the page body.

The margin: 0%; places the body contents to the outsides of the client window, without this, there is an automatic margin placed on the body by browsers.

4.2a Starting the CSS in DW MX