@media screen and (max-width: 767px) {
    body {
        width: 100%;
    }
    #Contents {
        width: 100%;
        min-width: 290px;
        padding-right: 15px;
        padding-left: 15px;
        padding-bottom: 1px;
        box-sizing: border-box;
    }
    .GridSet {
        width: 100%;
    }
}