.col-xs-15,
.col-sm-15,
.col-md-15,
.col-lg-15
{
    position: relative;
    min-height: 1px;
    padding-right: 10px;
    padding-left: 10px;
}
 
.col-xs-15
{
    width: 20%;
    float: left;
}
 
@media (min-width: 768px)
{
    .col-sm-15
    {
        width: 20%;
        float: left;
    }
}
 
@media (min-width: 992px)
{
     .col-md-15
     {
        width: 20%;
        float: left;
    }
}
 
@media (min-width: 1200px)
{
    .col-lg-15
    {
        width: 20%;
        float: left;
    }
}