uc-low-globals.css

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 * Attribution-NonCommercial-ShareAlike International License, v. 4.0.
 * If a copy of the CC BY-NC-SA 4.0 was not distributed with this
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 * or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA. */

:root,
tooltip {
  --in-content-bg-dark: #19191b;
  --in-content-bg-darker: #151517;
  --in-content-box-bg-dark: hsl(240, 4%, 13%);
  --in-content-button-highlight-dark: hsl(240, 4%, 15%);
  --in-content-separator-dim: hsl(240, 4%, 26%);
  --in-content-border-color-dim: hsl(240, 4%, 21%);
  --plaintext-color: hsla(0, 0%, 100%, 0.932);
  --uc-menu-border-color: hsl(233, 23%, 20%);
  --tooltip-bgcolor: hsl(233, 36%, 11%);
  --tooltip-color: white;
  --tooltip-border-radius: 3px;
  --tooltip-border-color: var(--uc-menu-border-color);
  --tooltip-box-shadow: 0 0 5px hsla(0, 0%, 0%, 0.2);
  --transparent-img-background: center/16px repeat hsla(0, 0%, 80%) url(chrome://userchrome/content/checker.svg);
  --transparent-img-background-context: center/16px repeat url(chrome://userchrome/content/checker-context.svg);
}

@media (prefers-color-scheme: dark) {
  :root {
    --transparent-img-background: center/16px repeat hsla(0, 0%, 20%) url(chrome://userchrome/content/checker-dark.svg);
  }
}