Outside of the personally attested need to contribute, the satisfaction of others is precisely my aim (i.e. I'm glad to hear it).
Having fixed and inspected the background CSS under all the commonly used screen resolutions, the problem should be no more. By the way, the pleasure is mine, my friend.
Spoiler: ... pleased to confirm that it is solved (click to see content)
...still impressed by your excellent conversion choices...
Same passion for dark oldies (rushing beat series, denjin makai series, final fight series...)
Spoiler: BTW (click to see content)
Spoiler: Talking about rushing beat series (click to see content)