* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
@media screen and (max-width: 768px){
    .col-sm-2 {
        width: 16.666%;
    }
    .col-sm-3 {
        width: 25%;
    }
    .col-sm-6 {
        width: 50%;
    }
    .col-sm-8 {
        width: 66.666%;
    }
    .col-sm-12 {
        width: 100%;
    }
}
[class*=col-] {
    float: left;
    display: inline-block;
    padding: 10px;
    min-height: 70px;
}
[class*=col-] div {
    padding: 5px;
    min-height: 50px;
    border: 1px solid #999;
    background-color: #eee;
}
@media screen and (min-width: 768px) {
    .col-md-1 {
        width: 8.333%;
    }

    .col-md-2 {
        width: 16.666%;
    }

    .col-md-3 {
        width: 25%;
    }

    .col-md-4 {
        width: 33.333%;
    }

    .col-md-6 {
        width: 50%;
    }

    .col-md-8 {
        width: 66.666%;
    }

    .col-md-12 {
        width: 100%;
    }
}