Single post in A Somewhat Extensive Guide to BBCodes

You can use the CSS attributes height and overflow inside an accordion to get a vertical scrollbar. Just make sure that the height is reasonable. [accordion][ ][a-section=Test][ ][css=height: 150px; overflow: scroll;]TEXT HERE[/css][ ][/a-section][ ][/accordion]

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Dummy text to show that scrolling works~ Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus gravida sapien in nibh semper, nec semper ex sollicitudin. Sed rhoncus semper nulla in lacinia. Phasellus maximus vehicula consequat. Nulla tempor sem nec nisl tristique, eu pharetra metus facilisis. Quisque dapibus turpis ut arcu pulvinar ultricies. Pellentesque fringilla tempor nunc, at scelerisque dolor tincidunt a. Mauris nec porttitor mi. Mauris eu mi nec nibh faucibus tincidunt id et ligula. Maecenas ligula erat, rutrum eu nisi ac, eleifend ullamcorper nulla. Quisque eget purus gravida, faucibus odio et, pharetra nunc. Proin arcu est, tempor at dui at, tristique volutpat lacus. In mattis pulvinar diam eget viverra.