Enforce dark mode

enforce_dark_mode.js

function addCss(rule) {
  let css = document.createElement('style');
  css.type = 'text/css';
  if (css.styleSheet) css.styleSheet.cssText = rule;
  else css.appendChild(document.createTextNode(rule));
  document.getElementsByTagName("head")[0].appendChild(css);
}
var rule = ':root{background-color:#fff;filter:invert(100%)}*{background-color:inherit}img:not([src*=".svg"]),video{filter:invert(100%)}';
addCss(rule);