CSS for user limit error
CSS for user limit error

See https://github.com/matrix-org/matrix-react-sdk/pull/2108

vector-im/riot-web,vector-im/riot-web,vector-im/riot-web,vector-im/vector-web,vector-im/vector-web,vector-im/vector-web,vector-im/riot-web,vector-im/vector-web,vector-im/riot-web,vector-im/vector-web,vector-im/riot-web