#3A8169

CSS

:root {
  --shadows-of-time: #3a8169;
  --shadows-of-time-rgb: 58 129 105;
  --shadows-of-time-oklch: oklch(0.55 0.081 168.6);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(160 38% 37%);
  border-color: oklch(0.55 0.081 168.6);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #3a8169;
  --color-shadows-of-time-50: #dffdf2;
  --color-shadows-of-time-100: #cef1e4;
  --color-shadows-of-time-200: #b2e0cf;
  --color-shadows-of-time-300: #8dc5b1;
  --color-shadows-of-time-400: #6cae96;
  --color-shadows-of-time-500: #48987c;
  --color-shadows-of-time-600: #3e8069;
  --color-shadows-of-time-700: #316754;
  --color-shadows-of-time-800: #234b3c;
  --color-shadows-of-time-900: #183429;
  --color-shadows-of-time-950: #082017;
}

SCSS

$shadows-of-time: #3a8169;
$shadows-of-time-rgb: 58, 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);
}