Using the Style function with slot (#), ... (/) and ... (@)
headers = Style[#, {FontFamily -> "Arial", FontSize -> 20}] & /@ {"A", "B", "C"}
Grid[Prepend[{{g, g, g}}, headers]]
Using the Style function with slot (#), ... (/) and ... (@)
headers = Style[#, {FontFamily -> "Arial", FontSize -> 20}] & /@ {"A", "B", "C"}
Grid[Prepend[{{g, g, g}}, headers]]