video{-o-object-fit:contain;object-fit:contain}.video-js{width:100%;height:100%}.teacher-letter-qr{width:100vw;height:100vh;overflow:hidden}.teacher-letter-qr__bg{width:100%;height:100%;position:fixed;left:0;right:0;top:0;bottom:0}.teacher-letter-qr__logo{position:fixed;width:7.92vw;left:3.33vw;top:3.23vw}.teacher-letter-qr__main{width:36vw}.teacher-letter-qr__content{position:fixed;width:36vw;left:50%;top:calc(50% - 12vw - 102px);margin-left:-18vw;display:flex;flex-direction:column;align-items:center}.teacher-letter-qr__text{color:#fff;text-align:center;font-size:1.667vw;line-height:2.396vw}.teacher-letter-qr #qrcode{margin:4.583vw auto 1.354vw;border-radius:1.8vw}