Scrollbars on every page

I cannot seem to find the magic sauce to only get scrollbars when they are necessary.

Even on the simplest page, the login overlay, I get a horizontal scrollbar.

On pages that are not taller than the browser window, I will still get vertical scrollbars.

Is there something simple that I am missing on this?

Some Java source code and/or HTML structure would be nice to see to help you.