.head {
    width: 100%;
    height: 44px;
    float: left;
    overflow: hidden;
    position: relative;
    -webkit-transform: translate3d(0,0,0);
    z-index: 99999;
}
.img {
    width: 100%;
    float: left;
    text-align: center;
}

.mt__44 {
    margin-top: -44px;
}

.down_box {
    width: 100%;
    height: 159px;
    float: left;
    text-align: center;
    position: fixed;
    left: calc(50% - 700px);
    bottom: 0;
    opacity: 0.78;
    background-image:url("../img/foot.png");
    z-index: 1;
}
.down_box .btn {
    width: 188px;
    line-height: 52px;
    float: left;
    background-color: #333;
    border-radius: 50px;
    font-size: 19px;
    color: #fff;
    text-align: center;
    position: fixed;
    bottom: 40px;
    left: calc(50% - -330px);
    margin-left: -94px;
}


.down_box.pa {
    position: absolute;
}

.dp_n {
    display: none;
}

.footer {
    text-align: center;
    font-size: 16px;
    color: #262020;
    position: relative;
    bottom: 145px;
}