Hydrargyrum

CSS

:root {
  --hydrargyrum: #9b9b9b;
  --hydrargyrum-rgb: 155 155 155;
  --hydrargyrum-oklch: oklch(0.689 0 0);
}

.element {
  color: var(--hydrargyrum);
  background-color: hsl(0 0% 61%);
  border-color: oklch(0.689 0 0);
}

Tailwind CSS v4

@theme {
  --color-hydrargyrum: #9b9b9b;
  --color-hydrargyrum-50: #f5f5f5;
  --color-hydrargyrum-100: #e8e8e8;
  --color-hydrargyrum-200: #d4d4d4;
  --color-hydrargyrum-300: #b7b7b7;
  --color-hydrargyrum-400: #9e9e9e;
  --color-hydrargyrum-500: #868686;
  --color-hydrargyrum-600: #717171;
  --color-hydrargyrum-700: #5b5b5b;
  --color-hydrargyrum-800: #424242;
  --color-hydrargyrum-900: #2e2e2e;
  --color-hydrargyrum-950: #1b1b1b;
}

SCSS

$hydrargyrum: #9b9b9b;
$hydrargyrum-rgb: 155, 155, 155;
$hydrargyrum-light: mix(#fff, $hydrargyrum, 20%);
$hydrargyrum-dark: mix(#000, $hydrargyrum, 20%);

.element {
  color: $hydrargyrum;
  box-shadow: 0 0 0 2px rgba($hydrargyrum, 0.35);
}