.col-xs-5ths, .col-sm-5ths, .col-md-5ths, .col-lg-5ths {
    position: relative;
    min-height: 1px;
    padding-right: 10px;
    padding-left: 10px;
}


@media ( min-width : 768px) {
    .col-sm-5ths {
        width: 20%;
        float: left;
    }
}
 
@media ( min-width : 992px) {
    .col-md-5ths {
        width: 20%;
        float: left;
    }
}
 
@media ( min-width : 1200px) {
    .col-lg-5ths {
        width: 20%;
        float: left;
    }
}

@media (min-width: 75em) {/*宽屏*/
    .col-lg-5ths {
        width: 20%;
        float: left;
    }
}
@media (max-width: 767px) { /*手机尺寸*/

    .col-xs-5ths {
        width: 20%;
        float: left;
    }
}