@media screen and (min-width: 1200px) {
    header .header-box {
     background: none;
    }
    header .header-line {
        background: none; 
    }
    header .wrap-line {
        /*background: none; */
    }
}
.banner_txt {
    display: block;
    width: 640px;
    height: 81px;
    position: absolute;
    left: 50%;
    top: 65%;
    z-index: 2;
    text-align: center;
    transform: translate(-50%,-50%);
    -webkit-transform: translate(-50%,-50%);
    font-family: 'TencentSansw3';
    letter-spacing: 18px;
}
.banner_txt .txtbox h1 {
    display: inline-block;
    color: #fff;
    font-size: 20px;
    text-shadow: 2px 2px 5px #072146;

}
.banner_txt .txtbox h2 {
    display: inline-block;
    color: #fff;
    font-size: 12px;
    text-shadow: 2px 2px 5px #072146;
}
.slide_tips {
    display: none;
    width: 30px;
    height: 57px;
    position: absolute;
    left: 50%;
    margin-left: -15px;
    bottom: 62px;
    z-index: 2;
}
@media screen and (min-width: 640px) {
    .banner_txt .txtbox h1 {
        color: #ffffff;
        font-size: 54px;
    }
    .banner_txt .txtbox h2 {
        color: #ffffff;
        font-size: 18px;
    }
    .banner_txt {
        top: 45%;
    }
    .slide_tips { 
        display: block;
    }
}