媒体查询@media 屏幕适配

@media(max-width: 1199px){.banner{height: 400px;}}1.6倍
@media(min-width: 1200px) and (max-width: 1365px;)}  1.6倍
@media(min-width: 1366px) and (max-width: 1599px){.banner{height: 456px;}}  1.4倍
@media(min-width: 1600px) and (max-width: 1919px){.banner{height: 532px;}}  1.2倍
@media(min-width:1920px){.banner{height: 640px;}