Reply To: I have unlocked the secrets of dark mode !
i can even put a custom background
simply download the page as html, open the file using notepad
add these lines in style:
html {
background: url(example.png) no-repeat center center fixed;
background-size: cover;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;}