Dark appearance for High Sierra

Would it be possible to provide a Dark Appearance theme for High Sierra and previous versions? I like the Scrivener Dark Appearance in Mojave a lot, even if I am not using the OS X dark setting. I have customized my Scrivener appearance but my goal would be to enjoy the Mojave dark appearance in High Sierra.
N.B.- I have attempted to use a script to start Scrivener (do shell script “/Applications/Scrivener.app/Contents/MacOS/Scrivener -NSWindowDarkChocolate YES >/dev/null 2>&1 &”) but I cannot get what I am searching for.

The Scrivener → Preferences pane has a “Manage” menu in the lower left, which you can use to Save and Load custom themes.

I know, but, for example, in High Sierra, if I have black colour un my Notes background, the cursor is not visible…

You’ll need to tweak the theme for use on the High Sierra system, as High Sierra doesn’t have the operating system hooks that Scrivener uses to resolve that sort of conflict.

The main reasons we never implemented a dark mode in the software prior to Apple providing development toolkit for doing so still applies, and even more so, since systems that do not support dark mode are at this point in time very old and have comparatively few people using them. The amount of effort (months of work!) it would take to do this simply wasn’t worth it even back then. The point you bring up is a good example in fact, as it’s not just a matter of creating a whole suite of replacement graphics to skin the entire UI, down to scrollbars and checkboxes, it’s rewriting at a fairly deep level all manner of text display code that isn’t meant to be overridden.

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Thank you very much for your answer. I understand. In fact, the only real problem I have with my customized Scrivener “dark” appearance in High Sierra is the not visible cursor in the Notes area. For the rest, it’s good enough.