The 100vw include the width of the vertical scrollbar so basically it's equivalent to 100% + scrollbar width and since you have the vertical scrollbar you will always have a small overflow equal to the width of the scrollbar and this will trigger the horizontal scrollbar.
Thanks! Adding these changes.
I don't fully understand the difference between 100vw vs 100% thing though. Could you give me some info on that one?
The 100vw include the width of the vertical scrollbar so basically it's equivalent to
100% + scrollbar widthand since you have the vertical scrollbar you will always have a small overflow equal to the width of the scrollbar and this will trigger the horizontal scrollbar.This is a great explanation. Thank you!