Improve fonts and matching character color in CSS
Change the link hint char back from red to yellow

Red draws the eye powerfully, which I think is counter-productive
here. You don't want to focus on the character you've already typed, but
rather the character you have left to type.
Revert "Improve fonts and matching character color in CSS"

This reverts commit e93b1b1f36d31a693978a9cc71e10d95ab1fba4a.

Reverting because the experience is poor for Linux users. If we can
patch this to also look nice for Linux users, then win.
Add coffeelint to help conform to the style guide
Modify code to better fit with style guide recommendations

This makes the changes to the code suggested by coffeelint.