html,body{margin:0;padding:0;width:100%;height:100%}body{margin:0px;padding:0px;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;overflow:hidden;--backdrop-color:transparent;font:14px/1.5 "PingFang SC",
  "微软雅黑",
  "Microsoft YaHei",
  Helvetica,
  "Helvetica Neue",
  Tahoma,
  Arial,
  sans-serif}