The bottom starts from above the hole, and the top goes up to the area where the cover closes.
Artist's commentary
Hang in There, Kogasa-san 3341
It was a comment on NicoNico Seiga, and I was able to read several developments after I responded, so I couldn't say anything. My sincere gratitude to those who informed me.
Strive not to have misunderstandings like this, everyone! :-)