XF 1.5 increase font size Forum

I know nothing about web design or CSS, I would like to help me to increase the font size on the forum. If possible some code to add to the existing 1px or 2px more.
Thank you very much.
Excuse this English as use or automatic translator
Throughout the forum, not only when reading a topic.
If possible some code to increase around 1 to 2 px to what exists in the existing style.
Thank you very much


XenForo moderator
Staff member
There is no global control for all fonts - you would need to adjust various style properties and/or edit CSS templates/use EXTRA.css.
As indicated not know anything about web design. Could you point me to put in the file EXTRA.css?
Thank you very much