Should be able to reset font.
Major overhaul: ditch Canvas and use normal HTML.
Edit letter step 1: flipping canvas with CSS 3D transform.
Edit letter step 2: modifying current letters after editing.
Only update letter if edit field is non-empty.
Enlarge font in canvas and other styling fixes.
General layout and styling.
More general styling and improvement of UX.
Add in mixins for cross browser compatibility.
Add footer and minor styling fixes.