#278366

CSS

:root {
  --shadows-of-time: #278366;
  --shadows-of-time-rgb: 39 131 102;
  --shadows-of-time-oklch: oklch(0.549 0.097 167.8);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(161 54% 33%);
  border-color: oklch(0.549 0.097 167.8);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #278366;
  --color-shadows-of-time-50: #dbfff1;
  --color-shadows-of-time-100: #c9f3e3;
  --color-shadows-of-time-200: #abe2ce;
  --color-shadows-of-time-300: #84c8b0;
  --color-shadows-of-time-400: #60b193;
  --color-shadows-of-time-500: #349a7a;
  --color-shadows-of-time-600: #2e8367;
  --color-shadows-of-time-700: #256952;
  --color-shadows-of-time-800: #1a4d3a;
  --color-shadows-of-time-900: #113528;
  --color-shadows-of-time-950: #032116;
}

SCSS

$shadows-of-time: #278366;
$shadows-of-time-rgb: 39, 131, 102;
$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);
}