Use the same color for headings that MDN does.
Replace tabs with spaces to be consistent with the remainder of the stylesheet.
For consistency, ensure there is always a space after the colon used to delimit CSS rule pairs.
Fix for styling that was incorrectly being applied to each item in a list, rather than to the list itself.
Removed the 'Summary' heading, plus re-jigged the formatting so there isn't too much space before the content.
Removed a negative margin hack we no longer seem to need.
Moved the web fonts into a separate 'fonts' directory.
Added additional variations of the OpenSans typeface.
Add font re-generation instructions to the README.
Updated to use the same set of monospace typefaces as MDN too.