#358267

CSS

:root {
  --shadows-of-time: #358267;
  --shadows-of-time-rgb: 53 130 103;
  --shadows-of-time-oklch: oklch(0.551 0.088 167.2);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(159 42% 36%);
  border-color: oklch(0.551 0.088 167.2);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #358267;
  --color-shadows-of-time-50: #defef1;
  --color-shadows-of-time-100: #ccf2e3;
  --color-shadows-of-time-200: #b0e1ce;
  --color-shadows-of-time-300: #8ac6b0;
  --color-shadows-of-time-400: #68af94;
  --color-shadows-of-time-500: #42997a;
  --color-shadows-of-time-600: #3a8167;
  --color-shadows-of-time-700: #2e6753;
  --color-shadows-of-time-800: #214c3b;
  --color-shadows-of-time-900: #163528;
  --color-shadows-of-time-950: #072016;
}

SCSS

$shadows-of-time: #358267;
$shadows-of-time-rgb: 53, 130, 103;
$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);
}