#318266

CSS

:root {
  --shadows-of-time: #318266;
  --shadows-of-time-rgb: 49 130 102;
  --shadows-of-time-oklch: oklch(0.549 0.091 167);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(159 45% 35%);
  border-color: oklch(0.549 0.091 167);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #318266;
  --color-shadows-of-time-50: #ddfef1;
  --color-shadows-of-time-100: #cbf2e3;
  --color-shadows-of-time-200: #afe1ce;
  --color-shadows-of-time-300: #88c7af;
  --color-shadows-of-time-400: #66b093;
  --color-shadows-of-time-500: #3f9979;
  --color-shadows-of-time-600: #378267;
  --color-shadows-of-time-700: #2b6852;
  --color-shadows-of-time-800: #1f4c3a;
  --color-shadows-of-time-900: #153528;
  --color-shadows-of-time-950: #062016;
}

SCSS

$shadows-of-time: #318266;
$shadows-of-time-rgb: 49, 130, 102;
$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);
}