ul,ol {
	list-style-type:none;
}

.clearfix:after {
	content:"";
	clear:both;
	display:block;
}

.clear {
	clear:both;
}
.section {
	margin-top: 100px;
	margin-right: auto;
	margin-left: auto;
	width: 300px;
}
.section #nav4 {
	width: 400px;
	height: 100px;
}
.section #nav4 li {
	float: left;
	margin-right: 5px;
}