.content-editable-placeholder{position:relative}.content-editable-placeholder.empty:before{content:attr(data-placeholder);position:absolute;left:0;right:0;color:#aaa;pointer-events:none;padding:8px}[data-component=message-channel] * .mention,[data-component=message-channel] .mention{background-color:#bfdbfe;color:#1e3a8a;font-weight:600;border-radius:4px;padding:2px 4px;font-size:14px}