html[data-theme="dark"] {
  --color-yellow-dark: #c9f;
  --color-yellow-mid: #83c;
  --color-yellow-soft: #85b;
  --color-yellow-subtle: #639;
}
html[data-theme]:not([data-theme="dark"]) .bg-bg {
  background: linear-gradient(to bottom, skyblue 40%, pink, lightyellow, palegreen, skyblue, plum);
  background-color: var(--color-bg);
  background-attachment: local;
}
html[data-theme="dark"] .bg-bg {
  background: linear-gradient(to bottom, #324 40%, #422, #442, #242, #224, #324);
  background-color: var(--color-bg);
  background-attachment: local;
}