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.
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!