AdminLTE is by far one of the great examples of what Bootstrap CSS can do if it’s properly bundled with pre-defined UI elements used for Admin control panels. Right now, there’s a massive amount of various admin panels on the net.
I’ve made a quick Proof of Concept on how we can easily convert default AdminLTE layout into a dark theme, with a bit of help from
yarn. AdminLTE Midnight Dark Theme is available on GitHub, with detailed description on how to run it in dev mode via AdminLTE repo. You might find it useful to go through customisation instructions first, before diving into contribution phase.