This is an experimental feature, and probably Google will make it official soon. So, without wasting your time let’s get started towards the steps. The dark mode in YouTube gives it a cinematic look which is pretty cool. So, major sites have gradually begun launching their own versions of a ‘ Dark’ or ‘ Night’ mode over recent months, including Twitter and Google Maps.
The harmful blue light causes headache, eye strain, etc.
Most of the electronic screens emit blue light, which is very dangerous for your eyes.