html, body,div,h1,h2,h3,h4,p,span,b,i,a,img{
    padding: 0;
    margin: 0;
}
a{
    text-decoration: none;
}
ul, li{
    list-style: none;
}
img{
    border: 0;
}
.cons{
    width: 1200px;
    margin: 0 auto;
}
.banner-box{
    width: 100%;
    height: 500px;
    background: url("./../imgs/banner.jpg") no-repeat center center;
    background-size: 100%;
}
.absolute-style{
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    margin: auto;
}
.p-t20{
    padding-top: 20px;
}
.f-r{
    float: right;
}
.f-l{
    float: left;
}
.f-60{
    font-size: 60px;
}
.text-center{
    text-align: center;
}
.color-fff{
    color: #fff;
}
.logo{
    overflow: hidden;
}
.logo img {
    float: left;
}
.header-nav{
    float: right;
}
.header-nav li{
    float: left;
    margin-left: 40px;
    line-height: 60px;
    font-size: 18px;
}
.header-nav a{
    color: #fff;
}
.header-nav li.active a{
    font-weight: bold;
}
.btn{
    background: none;
    border: 2px solid #fff;
    color: #fff;
    font-size: 24px;
    display: inline-block;
    width: 200px;
    height: 60px;
    border-radius: 10px;
    text-align: center;
    outline: none;
}
.btn:hover{
    color: #000;
    background: #fff;
}
.flex-box{
    display: flex;
    justify-content: space-between;
    margin-top: 40px;
}
.flex-box .con-tag{
    width: 260px;
    height: 260px;
    overflow: hidden;
    position: relative;
}
.flex-box .con-tag img{
    width: 100%;
    height: 100%;
    transition: all .4s;
}
.flex-box .con-tag div{
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    margin: auto;
    background: rgba(0,0,0,.4);
}
.flex-box .con-tag p{
    position: absolute;
    z-index: 11;
    left: 0;
    right: 0;
    bottom: 0;
    top: 0;
    display: block;
    height: 30px;
    margin: auto;
    text-align: center;
    color: #fff;
    font-size: 30px;
}

.flex-box .con-tag:hover img{
    transform: scale(1.2);
}
.footer{
    margin-top: 50px;
    background: #fff;
    color: #666;
    text-align: center;
}

/*down.html*/
.banner-box.down-box{
    background: #fff;
    height: 100%;
    width: 100%;
}
.banner-box.down-box .header-nav a{
    color: #333;
}
.banner-box.down-box .logo b{
    color: #333;
}
.down-box{
    width: 100%;
    background: #fff;
    padding: 30px;
}
.down-con{
    width: 900px;
    margin:0 auto;
    padding-top: 50px;
    overflow: hidden;
}
.down-txt{
    padding-left: 40px;
    padding-top: 100px;
}
.down-txt div a{
    width: 200px;
    border-radius: 20px;
    text-align: center;
    height: 40px;
    line-height: 40px;
    font-size: 18px;
    display: inline-block;
    margin-right: 30px;
    background: #f6f6f6;
    font-weight: bold;
    color: #ff7f00;
    border: 1px solid #ff7f00;
}
.down-txt div a img{
    position: relative;
    top: -3px;
    margin-right: 5px;
}
body, html{
    width: 100%;
    height: 100%;

    background: #383c55;
}
.banner-box.about-box{
    width: 100%;
    height: 100%;
}
.about-h1{
    width: 900px;
    margin: 0 auto;
    text-align: center;
    line-height: 60px;
    font-size: 50px;
}
.about-h2{
    width: 800px;
    line-height: 50px;
    margin: 0 auto;
}
.img-box {
    padding: 25px;
    background: #333;
}
.img-box img{
    width: 300px;
}
@media (max-width: 600px) {
    .down-box{
        padding: 20px 10px;
        color: #333;
    }
    .img-box {
        position: relative;
        height: 420px;
        overflow: hidden;
    }
    .img-box img{
        position: absolute;
        left: 10px;
        right: 10px;
        top: 110px;
        bottom: 10px;
        margin: auto;
        width: 255px;
    }
    .down-txt{
        padding-left: 0;
        padding-top: 0;
        color: #333;
        padding-top: 15px;
        text-align: center;
        width: 100%;
    }
    .down-txt p{
        padding-bottom: 10px;
    }
    .down-txt h2{
        padding-bottom: 12px;
    }
    .down-con{
        width: 100%;
        padding-top: 10px;
    }
    .down-txt div{
        text-align: center;
    }
    .down-txt div a{
        width: 160px;
        margin-right: 0;
        margin-left: 0;
        margin: 0 15px;
    }
    .img-box{
        float:none;
    }
}