.high-contrast * {
  background-color: #000 !important;
  color: #fff !important;
}
.negative-contrast * {
  background-color: #fff !important;
  color: #000 !important;
}
.grayscale {
  filter: grayscale(100%) !important;
}
.bright-background * {
  background-color: #ffffe0 !important;
  color: #000 !important;
}
.underline-links a {
  text-decoration: underline !important;
}
.readable-font {
  font-family: Arial, sans-serif !important;
}