title: Font size relative to the user's screen resolution?
body: <p>I have a fluid website and the menu is 20% of its width. I want the font size of the menu to be measured properly so it always fits the width of the box and never wrap to the next line.
  I was thinking of using "em" as a unit but it is relative to the browser's font size, so when I change resolutions the font size stays the same. </p>
  
  <p>Tried also pts and percentages. Nothing works as I need it...</p>
  
  <p>Give me a hint of how to proceed, please.</p>