Decrease file viewer font-size

[La0]

To please @calixteman and anger @marco-c

0.9em looks ok to me

[dotslash21]

I would like to work on this issue. Can you tell me the file to edit?

[dotslash21]

Hi! @La0 I'm looking forward to giving this a try, I need some directions to proceed as I'm new to opensource contribution.