.col-xs-15,
.col-sm-15,
.col-md-15,
.col-lg-15 {
    position: relative;
    min-height: 1px;
    padding-right: 15px;
    padding-left: 15px;
}
.col-xs-15{
    width: 20%;
    float: left;
}
.col-xs-45 {
    width: 80%;
    float: left;
}

@media (min-width: 768px) {
    .col-sm-45 {
        width: 80%;
        float: left;
    }
    .col-sm-15:nth-child(5n+1){
        clear: both;
    }
    .col-sm-15{
        width: 20%;
        float: left;
    }
}

@media (min-width: 992px) {
    .col-md-45 {
        width: 80%;
        float: left;
    }
    .col-md-15:nth-child(5n+1){
        clear: both;
    }
    .col-md-15{
        width: 20%;
        float: left;
    }
}

@media (min-width: 1200px) {
    .col-lg-45 {
        width: 80%;
        float: left;
    }
    .col-lg-15:nth-child(5n+1){
        clear: both;
    }
    .col-lg-15{
        width: 20%;
        float: left;
    }
}