improve app.css formatting (#4675)
improve app.css formatting (#4675)


optikfluffel/phoenix,rafbgarcia/phoenix,phoenixframework/phoenix,0x00evil/phoenix,nshafer/phoenix,nshafer/phoenix,rafbgarcia/phoenix,0x00evil/phoenix,0x00evil/phoenix,nshafer/phoenix,optikfluffel/phoenix,phoenixframework/phoenix,phoenixframework/phoenix,rafbgarcia/phoenix,optikfluffel/phoenix