How do you make Gmail big?

I may have the answer, because the other day I had to look at something. If you look at the % size it reads a small number. On that same page there is a tab to increase size and you can to 100% to more or less to read and print the file. I may have the answer, because the other day I had to look at something. If you look at the % size it reads a small number. On that same page there is a tab to increase size and you can to 100% to more or less to read and print the file.