Hello Jay your site too cool and no need to change anything in your site because your site itself a good looking so no need to change its layout and i have checked by making short of my site url and it also working fine. Nice work.
Thanks.
Nice clean design; I would suggest noting somewhere other than the <title> that it is a url shortening service.
I would also check out these 2 CSS Errors and the serious matter of that the document has no Doctype or parse mode!
The first tag i tried was actually two words and it gave me a message about not using "invalid characters"... maybe try to use some filter to add a "-" to substitute spaces or "invalid characters".
Also plan for something that adds a number at the end in case a string URL is already taken. So for example, the next person who uses the tag "namepro" should get a "namepro2" URL.