Fixed two typos in levels.js
Fixing CSS Editor and HTML Viewer layout in IE11

Loading this up in IE11 I noticed the CSS and HTML windows were on top of each other. Checking the CSS I saw the typo for box-sizing.
Merge pull request #63 from mhbuck/patch-1

CSS typo that fixes CSS Editor and HTML Viewer layout in IE11
Monospace fallback for the editor / code font.
Merge branch 'master' of github.com:flukeout/restaurant
fix typo in levels.js, removing duplicate word
Fixed fancy plate markup
Merge pull request #71 from jbylsma/master

Fixed fancy plate markup
Merge pull request #69 from teancom/master

fix typo in levels.js, removing duplicate word
Merge pull request #62 from jogloran/patch-1

Fixed two typos in levels.js
Merge branch 'master' of https://github.com/flukeout/restaurant
rename back levels_en.js to levels.js to ease merging