added css for disabled buttons
added css for disabled buttons

arno01/cryptocat,Raynes/cryptocat,PeterDaveHello/cryptocat,DoNotUseThisCodeJUSTFORKS/cryptocat,wakermahmud/cryptocat,arno01/cryptocat,PeterDaveHello/cryptocat,DGO143/cryptocat,DGO143/cryptocat,Raynes/cryptocat,DoNotUseThisCodeJUSTFORKS/cryptocat,Cryptodog/cryptocat,DGO143/cryptocat,Cryptodog/cryptocat,wakermahmud/cryptocat,DoNotUseThisCodeJUSTFORKS/cryptocat,Raynes/cryptocat