scrolling is confusing in landscape mode

Example: https://leaflet.pub/p/did:plc:3vdrgzr2zybocs45yfhcr6ur/3mfd2oxx5v22b

When in landscape mode, there are wide margins on the left and right sides. Scrolling only works when you scroll in the middle of the page, not in the margins. This makes it look like scrolling doesn’t work until you figure out the trick.

External discussion: https://news.ycombinator.com/item?id=47096957