.span_4_of_4{width:100%;}
.span_3_of_4{width:74.6%;}
.span_2_of_4{width:49.2%;}
.span_1_of_4{width:23.8%;}
@media only screen and (max-width:480px){.span_4_of_4{width:100%;}
.span_3_of_4{width:100%;}
.span_2_of_4{width:100%;}
.span_1_of_4{width:100%;}
}