I came across the dark mode feature from Semrush's blog then find out DarkLub which enables anyone to easily create a nice-looking dark mode for their blog and even websites.

Review Video: https://www.youtube.com/watch?v=X61HGCVm2-M

Pros
- Flexibility to customize everything from font, color n' design
- Woocommerce integration

Cons
- Unable to reduce the size of the dark mode option