auto: only when needed
Level 5 of 10Your goal
The child fits, so no scrollbar is needed. Switch to overflow: auto so the scrollbar disappears and the content area is back to 200 × 100.
Must use
overflowtarget content boxtarget outer edge (green = matched, red = not yet)
Feedback updates as you type, and your CSS is saved in this browser. Exact target numbers are in the Target panel.