Webpage darkening feature of system default theme

[Soundarya]

Currently the system default theme mode inside brave; doesn’t make the webpages dark. I know that experimental dark mode are there but in order to turn it on or off we need to restart the browser. That’s an unnecessary step when we have to do some urgent work & need the webpage dark mode enabled cause i dont want to get flashbanged everytime i open brave at night. Please merge the experimental dark mode with sustem default as default theme mode without webpage darkening feature is just as useless as not having dark mode at all.