#3C8168

CSS

:root {
  --shadows-of-time: #3c8168;
  --shadows-of-time-rgb: 60 129 104;
  --shadows-of-time-oklch: oklch(0.551 0.081 167.2);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(158 37% 37%);
  border-color: oklch(0.551 0.081 167.2);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #3c8168;
  --color-shadows-of-time-50: #e0fdf1;
  --color-shadows-of-time-100: #cff1e3;
  --color-shadows-of-time-200: #b3e0ce;
  --color-shadows-of-time-300: #8ec5b0;
  --color-shadows-of-time-400: #6dae95;
  --color-shadows-of-time-500: #4a977b;
  --color-shadows-of-time-600: #408068;
  --color-shadows-of-time-700: #336753;
  --color-shadows-of-time-800: #244b3b;
  --color-shadows-of-time-900: #183429;
  --color-shadows-of-time-950: #092017;
}

SCSS

$shadows-of-time: #3c8168;
$shadows-of-time-rgb: 60, 129, 104;
$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);
}