In this inner BODY box with the green border, there should be a bathroom tile. The bathroom tile should only be visible if the BODY box overlaps the centre of the viewport. If the BODY box ends above the centre of the viewport, then the bathroom tile will NOT be visible. Resizing the window should keep the position of the bathroom tile relative to the centre of the viewport, but the tile should still only be visible inside the BODY (green) box.
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