jQuery Grid Plugin - jqGrid

Hello,

   I am having problems setting jqgrid front size. I tried to set up font-size property both body and container div without result. Setting it using one css class into html table definition solves table body font size but not header and footer. 

   I can see font-size: 11px crossed into firebug but I cannot see any other property overriding it so I don't know why the browser (Chrome and Firefox) does not apply it.

   The only solution I could find was to set css font-size property for table tag, but it applies to all tables on the site. 

Is there any way to get changed font size for one single jqgrid table?

Regards