Question

How to change default font for questions and answers for all users without need to change it through editor? I mean admin sets a default font style and size for all users. But users still can change it.

Answer 1

This should be possible using your theme's CSS. Just add !important to the end of any font-family CSS rules. For example in the default theme, change line 39 to read:

body,td,input,textarea {font-size:12px; font-family:Verdana, Arial, Helvetica, sans-serif !important;}