I am trying to learn to do a scroll box on Live Journal. I have tried different codes I have seen on here but they didn't help. I want one like this: http://mujersita.livejournal.com/ just different colors. How do I do this??

That user has a paid account, and therefore can create custom styles and add things into the actual coding.

As far as I know, what you want to create can't be done with overrides.