Add vertical scroll bar option for Tabs

In several tabs there are loooong documents. It makes more sense to scroll the content rather than the whole page (which makes the other vertical tabs disappear off the top of the page). To add the scroll bar I gave the tab a class "scroll-text" and then I used some simple css to add the scroll bar. But it would be nice for you to add the option in the Tab UI to scroll the content of the tab instead of having to hack around it. see video screencapture of scrolling tab: https://www.awesomescreenshot.com/video/10010869?key=387892a7beaba8b098be4613051c7ca3 .scroll-text {max-height: 64vh; overflow-x: scroll; padding-right: 30px;}