#00866F

CSS

:root {
  --shadows-of-time: #00866f;
  --shadows-of-time-rgb: 0 134 111;
  --shadows-of-time-oklch: oklch(0.554 0.104 175);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(170 100% 26%);
  border-color: oklch(0.554 0.104 175);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #00866f;
  --color-shadows-of-time-50: #d7fff4;
  --color-shadows-of-time-100: #c4f4e7;
  --color-shadows-of-time-200: #a4e3d3;
  --color-shadows-of-time-300: #7ac9b6;
  --color-shadows-of-time-400: #51b39b;
  --color-shadows-of-time-500: #0d9c82;
  --color-shadows-of-time-600: #14846e;
  --color-shadows-of-time-700: #116a58;
  --color-shadows-of-time-800: #0c4e3f;
  --color-shadows-of-time-900: #08362b;
  --color-shadows-of-time-950: #002119;
}

SCSS

$shadows-of-time: #00866f;
$shadows-of-time-rgb: 0, 134, 111;
$shadows-of-time-light: mix(#fff, $shadows-of-time, 20%);
$shadows-of-time-dark: mix(#000, $shadows-of-time, 20%);

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