#388169

CSS

:root {
  --shadows-of-time: #388169;
  --shadows-of-time-rgb: 56 129 105;
  --shadows-of-time-oklch: oklch(0.55 0.083 168.9);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(160 39% 36%);
  border-color: oklch(0.55 0.083 168.9);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #388169;
  --color-shadows-of-time-50: #dffdf2;
  --color-shadows-of-time-100: #cef1e4;
  --color-shadows-of-time-200: #b2e0cf;
  --color-shadows-of-time-300: #8cc6b2;
  --color-shadows-of-time-400: #6baf96;
  --color-shadows-of-time-500: #46987d;
  --color-shadows-of-time-600: #3c806a;
  --color-shadows-of-time-700: #306754;
  --color-shadows-of-time-800: #224c3c;
  --color-shadows-of-time-900: #173429;
  --color-shadows-of-time-950: #072017;
}

SCSS

$shadows-of-time: #388169;
$shadows-of-time-rgb: 56, 129, 105;
$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);
}