Add visual cue for widgets with dead comms

Part of the new widget feature set where widgets can exist on the page while being stale, i.e. page refresh, kernel restart, etc... 
Yeah, we decided on using 2, because he was planning on changing `@border-radius-base` to 2.  @ellisonbg should this remain as 2?  Or should I use `@border-radius-base` like @Carreau suggests and then open a separate PR to set `@border-radius-base` to 2?