body {
    width: 1920px;
    margin: 0 auto;
    font-family: "微软雅黑";
}


#head {
    width: 1920px;
    height: 100px;
    /*position: fixed;*/
    top: 0;
    left: 0;
    /*z-index: 5;*/
    background-image: url("../img/DHT.jpg");
}

    #head a, #head a:hover, #head a:link, #head a:active {
        text-decoration: none;
        color:#ffffff;
    }


.menu {
    width: 100px;
}

    .menu .btna {
        width: 100%;
        display: inline-block;
        height: 30px;
        text-align: center;
    }

    .menu ul {
        width: 100%;
        padding: 0;
        margin: 0;
        list-style: none;
        display: none;
    }

        .menu ul li {
            width: 100%;
            padding: 0;
            margin: 0;
            list-style: none;
        }

.current {
    width: 100px;
    height: 350px;
    z-index: 9999999999999;
    position: relative;
    background-color: rgba(67,167,255,0.9);
}

    .current .btna {
        background-color: rgba(67,167,255,0.9);
        width: 100%;
    }

    .current ul {
        margin-top: 15px;
    }

.menu ul li {
    line-height: 50px;
    /*border:1px solid red;*/
    text-align: center;
    font-size: 18px;
    width: 100px;
    height: 50px;
    color: #ffffff;
}
#contact {
    width: 1920px;
    height: 393px;
    background-image: url("../img/WSRJ2_06.png");
}