Backport #29015 by @wxiaoguang Fix 2 problems: 1. Remove the legacy (non-existing) CSS: `class="btn btn-gray btn-radius"` 2. Remove the button styles inside the `ui message`, according to: https://fomantic-ui.com/collections/message.html , the button shouldn't have any border/padding. ### Before   ### After   Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>