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Scrolling drop boxes & scrolling navigation

I'm trying to create a drop-box that includes a scroll feature as there are a lot of items to be included in this drop-box.  I tried creating a container, but that doesn't look right as the scroll bar remains visible when the drop-box is closed.  Does anyone know of a better way to complete this?

I am also creating a page that scrolls down to each section when a navigation tab is clicked.  I have that part down, but I am also trying to make the nav bars change color when simply scrolling rather than clicking the nav buttons.  Anyone know how I can make the nav bars change colors when a certain section reaches the top when scrolling?