.box {
    border: 1px solid transparent;
    margin-left: -15px;
    margin-right: -15px;
    
    overflow: auto;
    zoom: 1;
}

.col {
    float: left;
    padding: 15px;
}

.item {
    float: left;
    width: 100%;
    margin-bottom: 30px;
}