.czkj-content-all {
    width: 1170px;
}

.gbdsj {
    height: 300px;
    position: relative;
    top: -450px;
}

.navbox3 {
    margin-left: -592px !important;
}

.topbg{
    position: relative
}

@media screen and (max-width: 640px) {
    html, body {
        width: 100%;
        height: 100%;
        overflow: scroll;
    }

    .topbg {
        min-height: 0px;
    }

    .gbdsj {
        height: 820px;
        width: 100%;
        position: relative;
        top: 0;
    }

    .czkj-content-all {
        width: 100%;
    }

    .czkj-content-all {
        width: 100%;
        height: 100%;
        position: static;
        margin-left: 0;
        margin-top: 0;
    }
}