Tour generates a bottom scroll-bar, when items are created near the margins

This might be caused by the padding on `.popover-navigation .row`. From what I can see, when scrolling nothing is shown and this padding gets over the page limit.

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After further searching, it seems that this weird behaviour is cause by using a padding-right:14px with a margin-right: -15px.
Overwritting both of those solves the issue.
I'll check the Git history to see why those were used and if we can remove this hack safely.