#008764

CSS

:root {
  --shadows-of-time: #008764;
  --shadows-of-time-rgb: 0 135 100;
  --shadows-of-time-oklch: oklch(0.553 0.114 166.8);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(164 100% 26%);
  border-color: oklch(0.553 0.114 166.8);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #008764;
  --color-shadows-of-time-50: #d7ffef;
  --color-shadows-of-time-100: #c4f5e1;
  --color-shadows-of-time-200: #a4e4cc;
  --color-shadows-of-time-300: #79caad;
  --color-shadows-of-time-400: #51b490;
  --color-shadows-of-time-500: #0d9d76;
  --color-shadows-of-time-600: #148564;
  --color-shadows-of-time-700: #116b50;
  --color-shadows-of-time-800: #0d4e38;
  --color-shadows-of-time-900: #093726;
  --color-shadows-of-time-950: #002115;
}

SCSS

$shadows-of-time: #008764;
$shadows-of-time-rgb: 0, 135, 100;
$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);
}