body,html{
    width: 100%;
    height: auto;
}
.app{
    width: 100%;

}
.header{
    width: 1200px;
    margin: 0 auto;
    display: flex;
    height: 120px;
    line-height: 120px;
    justify-content: space-between;
    align-items: center;
    
}
.header a{ 
    padding-top: 20px;
}
.header span{
    font-weight: 700;
    font-size: 26px;
}
.banner img{
    width: 100%;
    height: 540px;
    object-fit: cover;
}
.content{
    width: 1200px;
    margin: 0 auto;
    margin-bottom: 30px;
}
.content h2{
    text-align: center;
    margin: 50px 0;
}
.video_box{
    width: 500px;
    height: 300px;
    margin-right: 80px;
}
.video_box video{
    width: 100%;
    height: 100%;
}
.video_c{
    display: flex;
}
.video_c ul li a{
    font-size: 18px;
    line-height: 36px;
    color: #333;

}
.video_c ul li{
    width: 500px;
    border-bottom: 1px solid #333;
    padding-left: 10px;
    padding-right: 10px;
}
.footer{
    text-align: center;
    height: 50px;
    line-height: 50px;
    color: #fff;
    background-color: #0097e0;
}
.btn{
    background-color: #0097e0;
    color: #fff;
    width: 140px;
    height: 56px;
    line-height: 56px;
    border-radius: 10px;
    display: block;
    text-align: center;
    font-size: 20px;
    margin-top: 50px;
}
.md_con{
    border-bottom: 2px solid #e5e5e3;
    padding: 0 6px;
    margin: 50px 0 0 0;
}
.md_con p{
    display: inline-block;
    line-height: 50px;
    border-bottom: 2px solid #0097e0;
    color: #959595;
}
.md_bu{
    color: #959595;
    margin: 10px 0 80px 0;
    display: flex;
}
.md_bu li{
    margin-right: 10px;
}