Dark UI is starting to be a more common choice for designers. Nowadays, most interfaces have light and dark themes. It totally makes sense because a dark UI helps the device to conserve battery energy, enhance accessibility and accent colors. Apple, Microsoft and Google are doing a great job bringing Dark Mode to their products and OSs.
Dark Mode Colors
Choosing the right colors for dark mode is crucial. For the background, you can go for neutral colors such as #121212 as recommended by Material Design. You can even use black as the background color. You can experiment with multiple colors to decide on colors that’d match well with the background.