I know. You’ve learned about Facebook’s new iFrame support on Page tabs and you’re excited. You’ve designed a beautiful Web page that you’re anxious to embed into your Facebook Page's tab.
You've triple-checked your HTML markup and your CSS, making sure to adjust for any added padding and borders. You've followed the directions on our How to Create an iFrame Application for your Fan Page and added the application to your Page.
Upon refresh, you see ... the dreaded scrollbars!
Facebook's default height for iFramed pages
The default maximum height for an iFrame tab is 800 pixels. Facebook has no problem with you using methods it provides to override this limit, but that's the limit if you don't do anything about it. But you can do something about it!