Hacking The Web
From TheBeard Science Project Wiki
Re-Enable Scrolling
Sometimes after removing the modal box and background, the page still won't scroll up or down. On most web pages, I've found that this is caused by a style="overflow: hidden;" on a containing element, often the <body> tag. Removing this style will allow you to scroll. It may also be applied with a CSS class, so removing the class property pay also work.
