Grumble about the graphics choices: dark-grey-on-black-with-other-dark-colors is a terrible color scheme, that renders the borders nearly invisible.

There's a reason print maps have a standard set of colors, with very light blue for oceans, white for land backgrounds, and a variety of dark colors for features. The "modern white-on-black web aesthetic" only really works for text- and figure-heavy pages, where you must then use very light colors (white, yellow, light orange, light green) for features/lines.