Участник:Zaka09mute/common.js

var style = document.createElement("style");
var themeColor = document.createElement("meta");
style.innerText = `* { filter: invert(1); } img { filter: invert(0); }`;
themeColor.setAttribute("name", "theme-color");
themeColor.setAttribute("content", "#121212");
if(window.location.search.match(/dark=[1|true]+/gi)) {
  document.body.appendChild(style);
  document.head.appendChild(themeColor);
}