XI

Check: https://github.com/transcranial/jupyter-themer/blob/master/jupythemer/jupythemer.py#L62 the extention is ```.import```; and then check ```YOUR_LIB_DIR\jupythemer\styles\typography\serif.*``` my case is that ```serif.css``` so I changed the ```jupythemer.py``` code and let the extentions be the same (change all...

I didn't do anything else. After I ran the commend ```jupyter-themer -f [CODE_FONT]```and refreshed an opened notebooks I got such changes(my OS is windows10). Source_Code_Pro  Ubuntu_Mono  Inconsolata 

https://github.com/transcranial/jupyter-themer/issues/33#issuecomment-417864100