body {font: 125% "Lucida Grande", "Trebuchet MS", Verdana, sans-serif;}
header, nav, footer, article, sidebar {display:block;}
nav {float:left; width:20%; border:5px solid gray; background-color:tan; padding:3px; margin:3px;}
sidebar {float:right;  border:5px solid gray; background-color:tan; padding:3px; margin:3px;}
article {float:left; width:55%; padding:2px; margin:2px;}
article ul {margin:0; padding:0; list-style-type:none; text-align:center; }
footer {clear:both;}
nav ul li img {display:none;}