Allow the message to grow to fit the screen width

Setting the 'flex-grow: 1' style property allows the message to grow
horizontally to fill the space not used by the Dismiss button.

Change-Id: Ia3686e28ea4e36fb5faa38a3960f3d8838062eeb
Release-Notes: Message can grow horizontally to fill space not used by the Dismiss button
1 file changed