Issue84

References #84 

Chance to display diff denom (if possible):
Easy: 1-40%, 2-50%, 3-60%, 4-70%, 5-80%
Medium: 1-50%, 2-60%, 3-70%, 4-80%, 5-90%
Hard: 1-60%, 2-70%, 3-80%, 4-90%, 5-100%

Moved css styles.