Sure you can, but you will need to do a little JavaScript editing, which may mess up your game like MaraJade stated. But I didn’t have any knowledge and my tinkering worked fine, so don’t know what to say. 
Wish I could help you but I kinda forgot how its all exactly done. I think you had to open Index with Notepad or Notepad ++, and you got the code which you had to change. Then their was a label of Style.CSS under which all the things relating to font appeared. But I may be wrong as to what file it was, maybe it wasn’t Index? My mind is rusty.
Here are two threads I found about Font color and Link color, let me see if I can remember how to change background color.