There is finally a dark mode for GitLab. It is still in Alpha, but it looks quite good. It is available for git.ispconfig.org, you can configure it by going to your profile -> preferences. I like it, especially because I go through a lot of issues at night When will the forum have a dark mode?
The admin(s) need to create / install a dark theme and make it selectable by user, for both forum and tutorial, otherwise, it won't be possible. In my experience in creating simple app for website, I found that if an app is created using webview to access a site, one can simply play with its css, to overwrite the default light theme with a dark theme, or vice versa, or even change its css to whatever the app creator wanted, either by fixed or configurable settings. In any event, I haven't seen any app for this howtoforge website or ISPConfig software made / contributed by anyone yet, or I might have missed them, if there is any.
You can use prefers-color-scheme in css: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme For ISPConfig, we could have 3 themes that are installed by default: "Default (follows OS preference)", "Default (dark)" and "Default (light)".
