My college now wants me to post the documents as online resources on our BlackBoard Learn site. I have been asked however to use Arial or some other sans-serif font for the documents. I tried to fight this. I think switching these documents to Arial turns a beautiful document into something less so. I guess I was not very convincing. 

The documents are not very long, but it seems to take a long time when I highlight the whole document and change the font. This also changes the found in the math environments, which I don't want to do. I want all math fonts to remain the same. 

So I am wondering if I could just modify the style file. I just use the 'Generic" style, how would I modify it so that all non mathematical text was in a san-serif font?

Also are there any other sans-serif fonts in TeXmacs that you folks would recommend as an alternative to Arial?

Thanks in advance.