#008565

CSS

:root {
  --shadows-of-time: #008565;
  --shadows-of-time-rgb: 0 133 101;
  --shadows-of-time-oklch: oklch(0.548 0.11 168.5);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(166 100% 26%);
  border-color: oklch(0.548 0.11 168.5);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #008565;
  --color-shadows-of-time-50: #d7fff1;
  --color-shadows-of-time-100: #c4f4e3;
  --color-shadows-of-time-200: #a5e4cd;
  --color-shadows-of-time-300: #7acaaf;
  --color-shadows-of-time-400: #52b392;
  --color-shadows-of-time-500: #139d79;
  --color-shadows-of-time-600: #178566;
  --color-shadows-of-time-700: #136a52;
  --color-shadows-of-time-800: #0e4e3a;
  --color-shadows-of-time-900: #093628;
  --color-shadows-of-time-950: #002116;
}

SCSS

$shadows-of-time: #008565;
$shadows-of-time-rgb: 0, 133, 101;
$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);
}