#28836B

CSS

:root {
  --shadows-of-time: #28836b;
  --shadows-of-time-rgb: 40 131 107;
  --shadows-of-time-oklch: oklch(0.55 0.093 171.7);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(164 53% 34%);
  border-color: oklch(0.55 0.093 171.7);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #28836b;
  --color-shadows-of-time-50: #dbfef3;
  --color-shadows-of-time-100: #c9f3e5;
  --color-shadows-of-time-200: #ace2d1;
  --color-shadows-of-time-300: #84c7b3;
  --color-shadows-of-time-400: #60b098;
  --color-shadows-of-time-500: #359a7f;
  --color-shadows-of-time-600: #2f826b;
  --color-shadows-of-time-700: #256856;
  --color-shadows-of-time-800: #1a4d3d;
  --color-shadows-of-time-900: #11352a;
  --color-shadows-of-time-950: #032018;
}

SCSS

$shadows-of-time: #28836b;
$shadows-of-time-rgb: 40, 131, 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);
}