/*  GRID OF FOUR   ============================================================================= */

.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%;
}

/*  GO FULL WIDTH AT LESS THAN 480 PIXELS */

@media only screen and (max-width: 780px) {
    .span_4_of_4 {
        width: 100%;
    }

    .span_3_of_4 {
        width: 100%;
    }

    .span_2_of_4 {
        width: 100%;
    }

    .span_1_of_4 {
        width: 100%;
    }
}