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I'm not aware of a way to solve this consistently cross browser with root relative font sizing.
I'm following this hack which tricks browsers into doing the right thing: http://code.iamkate.com/html-and-css/fixing-browsers-broken-monospace-font-handling/
Screenshots
Before, code blocks font size is too large
After, code blocks font size is consistent
I have tested this in Firefox, Safari, Internet Explorer, Edge and Chrome