message: support user select
diff: body, html
  line-height: 1
  font-family: 'PingFang SC', 'STHeitiSC-Light', 'Helvetica-Light', arial, sans-serif, 'Droid Sans Fallback'
  - user-select: none
  -webkit-tap-highlight-color: transparent
  .border-top-1px, .border-right-1px, .border-bottom-1px, .border-left-1px
  