gist/web-browsers/usercss/black-background.user.css

/* ==UserStyle==
@name        (AMOLED) Black Background
@updateURL   https://gitea.blesmrt.net/mikaela/gist/raw/branch/master/web-browsers/usercss/black-background.user.css
@namespace   eu.aminda
@version     2024.22.2
==/UserStyle== */

body {
  background-color: #000000 !important;
}