1. Main in < >, it is not needed
2. No second main in closing
3. No units in margins and padding
4. Body uses [ ] bracket
5. Colour neededs to be spelled color
6. Extra 4 in line 35
7. CSC at the top not CSS
8. Width should be %
9. Font size should be in Ems
10. Height spelled wrong
11. Float not needed
12. HTML comment in line 52