.youku{max-width:100%;text-align:center}.youku:not(:last-child) .youku__base{margin-bottom:20px}.youku .yt-wrapper{margin:0 auto}.youku .iframe-wrapper{margin:0 auto;position:relative;width:100%}.youku .iframe-wrapper iframe{height:100%;left:0;position:absolute;top:0;width:100%}.youku .res-4x3{padding-bottom:75%}.youku .res-16x9{padding-bottom:56.25%}