Hi Gian -
I looked at your code and found a lot of extra stuff that is causing the template to stretch. There are font and paragraph tags for every line of text and codes for non-breaking spaces (& n b s p) that always cause stretching problems for people.
I did a quick pass on the code to make sure it doesnt stretch. It might not have the exact spacing that you want for the text but at least it won't have horizontal scroll
View the code here http://www.practiceboard.com/?5788794. Look at the demo below the code on the page. Grab the code from the top window --> take it to eBay Revise your Item and drop that code in the description.
Hope that helps!
Cara