12grid.css

/* clearfix solution */
.colgroup:before, .colgroup:after { content: "\0020"; display: block; height: 0; overflow: hidden; }
.colgroup:after { clear: both; }
.colgroup { zoom: 1; }

.col1, .col2, .col3, .col4, .col5, .col6 {
	float:left; 
}

.colgroup section, .colgroup .column { 
	/* padding: @padding-med; */
}
 
.colgroup .content {
	/* padding: @padding-med; */
}

.col1 { width:100%; }
.col2 { width:75%  }
.col3 { width:50%; }
.col4 { width:33.333%; }
.col5 { width: 25%; }
.col6 { width: 16.666%; }
.col7 { width: 8.333%; }