#2B826B

CSS

:root {
  --shadows-of-time: #2b826b;
  --shadows-of-time-rgb: 43 130 107;
  --shadows-of-time-oklch: oklch(0.548 0.09 172);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(164 50% 34%);
  border-color: oklch(0.548 0.09 172);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #2b826b;
  --color-shadows-of-time-50: #dcfef3;
  --color-shadows-of-time-100: #caf2e5;
  --color-shadows-of-time-200: #ade1d1;
  --color-shadows-of-time-300: #86c7b4;
  --color-shadows-of-time-400: #62b098;
  --color-shadows-of-time-500: #38997f;
  --color-shadows-of-time-600: #32826c;
  --color-shadows-of-time-700: #286856;
  --color-shadows-of-time-800: #1c4c3e;
  --color-shadows-of-time-900: #12352a;
  --color-shadows-of-time-950: #042018;
}

SCSS

$shadows-of-time: #2b826b;
$shadows-of-time-rgb: 43, 130, 107;
$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);
}