In the README.txt file it says to copy the CSS file into your theme directory to override. The CSS file needs to be in a "layouts" directory in your theme in order for the panels module to pick it up.

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sun’s picture

sun
Primary language German
Location Karlsruhe
commented
Status: Active » Closed (won't fix)

Sorry, Panels 1.x is no longer maintained. Consider upgrading to 2.x, please.