The walked row's ring-1 is a box-shadow painted OUTSIDE the border box;
the list's overflow-y-auto makes overflow-x clip at the padding box too
(CSS: a non-visible axis forces the other to auto), so the 1px halo was
shaved on both sides. Replaced with the quiz rows' bg-accent/40 filled
tint and added px-1 to the list so the highlight never touches the
edges (owner round 5).