[thelist] font accessibility CSS

[Andrew]

Hi
What's necessary to use with css to make the font accessibility compliant?

I am currently using this and it isn't right :(

p,ul,li {
	font: 16px/21px trebuchet MS, verdana, arial, sans-serif;
	color : #000000;
	margin: 10px 15px 15px 0px;
	}
Thank you 
Andrew