customize font in servicedesk

customize font in servicedesk

 
Hi
 
I want to customize fonts in servicedesk.
LTR font is verdana by default and i'm ok with it.
 
I want to change default arabic font to tahoma, because Verdana is very hard to read for user.
 
I found sdStyle_RTL.css, but it completly change the direction of the software.
 
I only want to change the font of arabic language and left software in LTR.
 
could you please help me and let  me know which css should i modify
 
Many thanks
bigexex
 

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