Don't know if this might impact your menu, but think EM is a better unit of measurement for fonts on the Web
See for instance
http://www.w3schools.com/cssref/css_units.asp
Quote:
em
1em is equal to the current font size. 2em means 2 times the size of the current font. E.g., if an element is displayed with a font of 12 pt, then '2em' is 24 pt. The 'em' is a very useful unit in CSS, since it can adapt automatically to the font that the reader uses
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