html {
  background-color: #383838 !important;
}
html {
  filter: invert(100%) hue-rotate(180deg) brightness(105%) contrast(85%);
  -webkit-filter: invert(100%) hue-rotate(180deg) brightness(105%) contrast(85%);
}
body {
  background-color: #FFF !important;
}
img,
video,
body * [style*="background-image"] {
  filter: hue-rotate(180deg) contrast(100%) invert(100%);
  -webkit-filter: hue-rotate(180deg) contrast(100%) invert(100%);
}

/* https://css-tricks.com/a-complete-guide-to-dark-mode-on-the-web/ */