*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;overflow:hidden;background:#f5f7fa}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:#f0f2f6}::-webkit-scrollbar-thumb{background:#c8d0dc;border-radius:3px}