.col-xs-15,
.col-sm-15,
.col-md-15,
.col-lg-15 {
    position: relative;
    min-height: 1px;
    padding-right: 10px;
    padding-left: 10px;
}


@media (min-width: 768px) {
.col-xs-15 {
       width:50%;
        float: left;
    }
}

@media (min-width: 1020px) {
.col-sm-15 {
       width:33.33333333%;
        float: left;
    }
}

@media (min-width: 1200px) {
    .col-md-15 {
        width: 25%;
        float: left;
    }
}

@media (min-width: 1750px) {
    .col-lg-15 {
        width: 20%;
        float: left;
    }
}