*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html,body,#app{width:100%;height:100%}html{background:#000}body{min-width:320px;overflow:hidden;background:#000;color:#fff;font-family:Arial,PingFang SC,Microsoft YaHei,sans-serif}button,input,textarea,select{font:inherit}