#00866D

CSS

:root {
  --shadows-of-time: #00866d;
  --shadows-of-time-rgb: 0 134 109;
  --shadows-of-time-oklch: oklch(0.553 0.106 173.5);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(169 100% 26%);
  border-color: oklch(0.553 0.106 173.5);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #00866d;
  --color-shadows-of-time-50: #d7fff4;
  --color-shadows-of-time-100: #c4f4e6;
  --color-shadows-of-time-200: #a4e4d2;
  --color-shadows-of-time-300: #7ac9b5;
  --color-shadows-of-time-400: #51b399;
  --color-shadows-of-time-500: #0e9c80;
  --color-shadows-of-time-600: #14846c;
  --color-shadows-of-time-700: #116a57;
  --color-shadows-of-time-800: #0c4e3e;
  --color-shadows-of-time-900: #08362a;
  --color-shadows-of-time-950: #002118;
}

SCSS

$shadows-of-time: #00866d;
$shadows-of-time-rgb: 0, 134, 109;
$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);
}