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New theme here just for make the theme darker (not complete but ok) for Stylish github.com/Sb3kt1n/-/blob/master/responsive.css (don't work on forum, for the forum you can use the old for now)
Sb3kt1n is having trouble posting his response due to browser issues, so here it is:
Sb3kt1n said: When you have installed stylish go to "create new style" -> "for gelbooru.com.." after this, copy the content of this github.com/Sb3kt1n/-/blob/master/responsive.css in the "new style" tab and chose a name for the theme ( you can chose the name you prefer) and click "preview" So you can see the theme without having to install, if you like click save and enjoy the theme, you can disable it from the stylish icon whenever you want.
preview.ibb.co/nMdxFQ/ex.png here an example of the theme, only the forum don't work with this theme, but you can disable if you need to post something.