.ban {
    background:#ccc;
}
.ban video{
    width: 1200px;
    margin-left: -600px;
    position: absolute;
    left: 50%;
}
.ter {
    margin-top: 200px;
}
.nav2 img{
    width: 300px;
    height: 100px;
}
.ttoi {
    width: 1200px;
}
.bott {
    top: 3020px;
}
.zci{
    top: 3000px;
    
}