#structure {
	text-align: center;
	width: 100%;
}
#main-content {
	text-align:left;/* for IE */
	margin: 0 auto;
	width:780px;
}
#content {
	text-align: center;
	width: 720px;
	margin: 10px auto 100px;
	padding: 0;
}
.box {
	width: 180px;
	height: 80px;
	float: left;
	border-width: 0;
	margin: 0 auto;
}
.article {
	line-height: 1.3em;
	width: 160px;
	height: 60px;
	margin: 10px auto;
	border-color: #dddddd #aaaaaa;
	border-width: 1px;
	border-style: solid;
	color: #000;
}
.box a {
	position: relative;
	width: 160px;
	height: 60px;
	display: block;
	text-decoration: none;
	color: #000;
}

.article span {
	background-color: #fff;
}
#footer {
	clear: both !important;
}