.clear_column{clear:both;display:block;font-size:0;height:0;line-height:0;width:100%;overflow:hidden}.one_half{width:50%}.one_fourth{width:25%}.three_fourth{width:75%}.one_fifth{width:20%}.two_fifth{width:40%}.three_fifth{width:60%}.four_fifth{width:80%}.one_sixth{width:16.6%}.five_sixth{width:83.4%}