Dark Mode in one line

darkMode.js

  let sheet = (function () {
    // Create the <style> tag
    var style = document.createElement('style');

    // Add a media (and/or media query) here if you'd like!
    // style.setAttribute("media", "screen")
    // style.setAttribute("media", "only screen and (max-width : 1024px)")

    // WebKit hack :(
    style.appendChild(document.createTextNode(''));

    // Add the <style> element to the page
    document.head.appendChild(style);

    return style.sheet;
  })();
  sheet.insertRule(':root{filter: invert(.85) saturate(0)}', 0);