body{max-width:750px;margin:0 auto;min-width:320px;line-height:normal;color:#333;background-color:#f5f5f5}.bulletscreeniframe{width:100%;height:calc(100vh - 50px)}.bulletscreeniframe::-webkit-scrollbar{display:none}.bulletscreenvideo{width:100%;max-height:calc(100vh - 50px)}