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

It seems that these styles come from bootstrap standard (row) and bootstrap-tour (.popover-navigation).
We now have a hand on bootstrap code, but the .row class might be used in plenty of other components, so we don't want to change it carefully.

We do not have a hand on bootstrap-tour code, so I think the best solution would be to EITHER overwrite those styles in our custom stylesheet (setting both margin and padding to zero seems to work here...) OR remove the classes responsible for this styling from the generated element (might not be possible because it would be the responsibility of bootstrap tour).