#1B8664

CSS

:root {
  --shadows-of-time: #1b8664;
  --shadows-of-time-rgb: 27 134 100;
  --shadows-of-time-oklch: oklch(0.554 0.107 166);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(161 66% 32%);
  border-color: oklch(0.554 0.107 166);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #1b8664;
  --color-shadows-of-time-50: #d9ffef;
  --color-shadows-of-time-100: #c6f4e1;
  --color-shadows-of-time-200: #a8e4cc;
  --color-shadows-of-time-300: #7fc9ad;
  --color-shadows-of-time-400: #59b390;
  --color-shadows-of-time-500: #269c76;
  --color-shadows-of-time-600: #248464;
  --color-shadows-of-time-700: #1d6a50;
  --color-shadows-of-time-800: #154e38;
  --color-shadows-of-time-900: #0d3626;
  --color-shadows-of-time-950: #012115;
}

SCSS

$shadows-of-time: #1b8664;
$shadows-of-time-rgb: 27, 134, 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);
}