Me too. I spend most of my days and nights writing and editing (mostly on Macs but sometimes on Chromebook). I have everything else set to dark/night mode to save my eyes. When I use the PWA desktop app, I have to turn on Invert Display to get a similar appearance. This works most of the time, but sometimes I have trouble seeing the underlined words and have to go back to the normal display colors.
Since you have already integrated with Scrivener, you might look at their themes for inspiration. I use their Solarized Dark most of the time. It saves my eyes without making anything difficult to understand visually.