#298569

CSS

:root {
  --shadows-of-time: #298569;
  --shadows-of-time-rgb: 41 133 105;
  --shadows-of-time-oklch: oklch(0.555 0.096 168.7);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(162 53% 34%);
  border-color: oklch(0.555 0.096 168.7);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #298569;
  --color-shadows-of-time-50: #dbfff1;
  --color-shadows-of-time-100: #c9f3e3;
  --color-shadows-of-time-200: #abe2ce;
  --color-shadows-of-time-300: #84c8b1;
  --color-shadows-of-time-400: #5fb194;
  --color-shadows-of-time-500: #349a7b;
  --color-shadows-of-time-600: #2e8368;
  --color-shadows-of-time-700: #256953;
  --color-shadows-of-time-800: #1a4d3b;
  --color-shadows-of-time-900: #113529;
  --color-shadows-of-time-950: #032116;
}

SCSS

$shadows-of-time: #298569;
$shadows-of-time-rgb: 41, 133, 105;
$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);
}