.center-box {
    width: 1140px;
    margin-left: auto;
    margin-right: auto;
}

.row {
    margin-left: -20px;
    margin-right: -20px;
}

.one-half {
    width: 50%;
}

.one-third {
    width: 33.33%;
}

.one-fourth {
    width: 25%;
}

.one-half, .one-third, .one-fourth {
    float: left;
    min-height: 1px;
    padding-left: 20px;
    padding-right: 20px;
}

@media only screen and (min-width: 768px) and (max-width: 1200px) {
    .center-box {
        width: 100%!important;
        padding-left: 30px;
        padding-right: 30px;
    }
}
   
@media only screen and (max-width: 768px) {
    .center-box {
        width: 100%!important;
        padding-left: 10px;
        padding-right: 10px;
    } 
        
    .full-width, .one-half, .one-third, .one-fourth {
        width: 100%;
        position: relative;
        float: none;
    }

    .one-half {
       padding-bottom: 30px;
    }

}