Add formatting to Identifying Item Errors solution

Author: dheles

episodes/12-for-loops.md

@@ -330,8 +330,17 @@ print(total)
 > seasons = ['Spring', 'Summer', 'Fall', 'Winter']
 > print('My favorite season is ', seasons[4])
 > ~~~
+> {: .python}
+>
 > > ## Solution
 > >
-> > It is an index error. The problem is that 4 points to an item that doesn't exist in the list. Remember the first item of a list in Python is 0. Subtitute seasons[4] for seasons[0], seasons[1], seasons[2] or seasons[3] to have the different items of the list printed.
-> {: .python}
+> > It is an index error:
+> > ~~~
+> > IndexError: list index out of range
+> > ~~~
+> > {: .error}
+> >
+> > The problem is that `4` points to an item that doesn't exist in the list. Remember the first item of a list in Python is `0`.  
+> > Replace `seasons[4]` with `seasons[0]`, `seasons[1]`, `seasons[2]` or `seasons[3]` to have the different items of the list printed.  
+> {: .solution}
 {: .challenge}