.site_center {text-align:center;}
.main {margin:0 auto; width:870px; text-align:left;}


.col_1, .col_2, .col_3, .col_4, .col_box_1, .col_box_2{ float:left;}

.content .col_1{width:280px;}
.content .col_2, .content .col_2 .col_box, .content .col_2 .col_box_row{width:575px;}

.content .col_4{width:825px;}