#3A8165

CSS

:root {
  --shadows-of-time: #3a8165;
  --shadows-of-time-rgb: 58 129 101;
  --shadows-of-time-oklch: oklch(0.549 0.085 165.1);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(156 38% 37%);
  border-color: oklch(0.549 0.085 165.1);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #3a8165;
  --color-shadows-of-time-50: #dffdf0;
  --color-shadows-of-time-100: #cef1e2;
  --color-shadows-of-time-200: #b2e0cd;
  --color-shadows-of-time-300: #8dc6ae;
  --color-shadows-of-time-400: #6caf92;
  --color-shadows-of-time-500: #489878;
  --color-shadows-of-time-600: #3e8166;
  --color-shadows-of-time-700: #326751;
  --color-shadows-of-time-800: #244c3a;
  --color-shadows-of-time-900: #183428;
  --color-shadows-of-time-950: #082016;
}

SCSS

$shadows-of-time: #3a8165;
$shadows-of-time-rgb: 58, 129, 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);
}