.h-lang { position: relative; margin-right: .27rem; }
.h-lang .hd { padding: .08rem 0; }
.h-lang .hd .i1 { width: .18rem; min-width: 18px; }
.h-lang .hd .i2 { width: .11rem; min-width: 11px; }
.h-lang .hd .t1 { margin: 0 .06rem; }
.h-lang .bd { position: absolute; left: 50%; top: 100%; width: 6em; background: #fff; color: #333; text-align: center; display: none; margin-left: -3em; }
.h-lang .bd a { display: block; -webkit-transition: all .3s; -o-transition: all .3s; transition: all .3s; padding: .4em .5em; }
.h-lang .bd a:hover { background: #ff6600; color: #fff; }
.h-lang:hover .bd { display: block; }

.banner_wrap .video{
    position: relative;
    padding-top: calc(850 / 1920 * 100%);
}
.banner_wrap .video video{
    position: absolute; left: 0; top: 0;
    width: 100%; height: 100%;
    object-fit: cover;
}