#header, #content, #footer {
    margin-left: auto;
    margin-right: auto;
}


.col-main {
    float: left;
    width: 100%;
    
    min-height: 1px;
}
.col-sub, .col-extra {
    float: left;
    
}


.clear, .layout:after, .main-wrap:after, .col-sub:after, .col-extra:after {
	content: '\20';
	display: block;
	height: 0;
	clear: both;
}
.clear, .layout, .main-wrap, .col-sub, .col-extra {
    *zoom: 1;
}