#37836A

CSS

:root {
  --shadows-of-time: #37836a;
  --shadows-of-time-rgb: 55 131 106;
  --shadows-of-time-oklch: oklch(0.555 0.085 168.7);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(160 41% 36%);
  border-color: oklch(0.555 0.085 168.7);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #37836a;
  --color-shadows-of-time-50: #defef2;
  --color-shadows-of-time-100: #cdf2e4;
  --color-shadows-of-time-200: #b0e1cf;
  --color-shadows-of-time-300: #8bc6b1;
  --color-shadows-of-time-400: #69af95;
  --color-shadows-of-time-500: #43987c;
  --color-shadows-of-time-600: #3a8169;
  --color-shadows-of-time-700: #2e6754;
  --color-shadows-of-time-800: #214c3c;
  --color-shadows-of-time-900: #163529;
  --color-shadows-of-time-950: #072017;
}

SCSS

$shadows-of-time: #37836a;
$shadows-of-time-rgb: 55, 131, 106;
$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);
}