Lol. Can I comment? Forgive me for this Ephe. Hehehe.. I can't help myself on giving a comment.
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Anyway I agree on Ephemeral's suggestion. It is wise to have a backup HTML with your CSS layout in it. Actually it is better to judge the layouts a generic HTML that the moderators will provide, and the judges or the contest conductors will test the .css files of the contestants into that HTML page.
Lol. I am actually excited on this one. It's much more organized and easier to manage than my previous contest because it only allows css layouts. Hehehe..
Good luck to all participants. Give your best.