#28856D

CSS

:root {
  --shadows-of-time: #28856d;
  --shadows-of-time-rgb: 40 133 109;
  --shadows-of-time-oklch: oklch(0.556 0.094 172);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(165 54% 34%);
  border-color: oklch(0.556 0.094 172);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #28856d;
  --color-shadows-of-time-50: #dbfff3;
  --color-shadows-of-time-100: #c9f3e5;
  --color-shadows-of-time-200: #abe2d1;
  --color-shadows-of-time-300: #83c8b4;
  --color-shadows-of-time-400: #5fb198;
  --color-shadows-of-time-500: #329a7f;
  --color-shadows-of-time-600: #2d826c;
  --color-shadows-of-time-700: #246856;
  --color-shadows-of-time-800: #194d3d;
  --color-shadows-of-time-900: #11352a;
  --color-shadows-of-time-950: #032018;
}

SCSS

$shadows-of-time: #28856d;
$shadows-of-time-rgb: 40, 133, 109;
$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);
}