* {margin: 0;
padding: 0;}
#wrapper {width: 900px;
margin: 20px auto;}
#nav ul {list-style: none;
margin-left: 10px;}
#nav
{background-color: #0F0;
height: 30px;
width: 100%;}
#nav ul li {
display: block;
float: left;
width: 75px;
height: 30px;
background: #0F0;
text-align: center;
line-height: 30px;}
#nav ul li a {
text-decoration: none;
color: #FFF;
font-weight: bold;
font-family: Arial;}
#nav ul li:hover {
background: #F00;}
#nav ul li a:hover {
color: #000;}