added .lang-json to default.css
added .lang-json to default.css

amitaibu/elm-lang.org,amitaibu/elm-lang.org,FranklinChen/elm-lang.org,FranklinChen/elm-lang.org,elm-guides/elm-lang.org,jvoigtlaender/elm-lang.org,jvoigtlaender/elm-lang.org,frankschmitt/elm-lang.org,elm-guides/elm-lang.org,frankschmitt/elm-lang.org