.yqk_b_bg{
    position: fixed;
    top:0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,.6);
    z-index: 201906;
    display: none;
}
.yqk_box{
    display: none;
    position: fixed;
    top:50%;
    left:50%;
    width: 618px;
    height: 314px;
    margin-left:-309px;
    margin-top:-157px;
    background: url("../images/yqk_bg.jpg") no-repeat;
    background-size: cover;
    z-index: 201906;
    -webkit-box-shadow:  0 0 10px rgba(0,0,0,.2);
    -moz-box-shadow: 0 0 10px rgba(0,0,0,.2);
    box-shadow:  0 0 10px rgba(0,0,0,.2);
}
.yqk_box .close_btn{
    position: absolute;
    top:0;
    right: 0;
    width: 45px;
    height: 45px;
    cursor: pointer;
}
.yqk_box .btn_box{
    position: absolute;
    height: 83px;
    left:0;
    bottom:0;
    width: 100%;
}
.yqk_box .btn_box .n_btn{
    display: block;
    float: left;
    width: 50%;
    height: 83px;
    outline: none;
}
@media (max-width: 815px){
    .yqk_box{
        width: 500px;
        height: 254px;
        margin-left:-250px;
        margin-top:-172px;
    }
}
@media (max-width: 570px){
    .yqk_box{
        width: 320px;
        height: 163px;
        margin-left:-160px;
        margin-top:-81px;
    }
    .yqk_box .btn_box{
        height: 45px;
    }
    .yqk_box .btn_box .n_btn{
        height: 45px;
    }
}
@media (max-width: 340px){
    .yqk_box{
        width: 280px;
        height: 142px;
        margin-left:-140px;
        margin-top:-71px;
    }

}