#278565

CSS

:root {
  --shadows-of-time: #278565;
  --shadows-of-time-rgb: 39 133 101;
  --shadows-of-time-oklch: oklch(0.554 0.1 166);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(160 55% 34%);
  border-color: oklch(0.554 0.1 166);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #278565;
  --color-shadows-of-time-50: #dbfff0;
  --color-shadows-of-time-100: #c9f3e1;
  --color-shadows-of-time-200: #abe3cc;
  --color-shadows-of-time-300: #83c8ae;
  --color-shadows-of-time-400: #5fb191;
  --color-shadows-of-time-500: #329b77;
  --color-shadows-of-time-600: #2d8365;
  --color-shadows-of-time-700: #246950;
  --color-shadows-of-time-800: #1a4d39;
  --color-shadows-of-time-900: #113627;
  --color-shadows-of-time-950: #032115;
}

SCSS

$shadows-of-time: #278565;
$shadows-of-time-rgb: 39, 133, 101;
$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);
}