html {
  /* use a non-default background color, so you can see difference of setting background pixels */
  background-color: #eee;
}

.noscript {
  color: red;
  font-weight: bold;
}

fieldset .font-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

#background-color-selector {
  display: none;
}

#debug {
  display: none;
}

#output {
  display: none;
}