#358266

CSS

:root {
  --shadows-of-time: #358266;
  --shadows-of-time-rgb: 53 130 102;
  --shadows-of-time-oklch: oklch(0.55 0.088 166.3);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(158 42% 36%);
  border-color: oklch(0.55 0.088 166.3);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #358266;
  --color-shadows-of-time-50: #defef0;
  --color-shadows-of-time-100: #ccf2e2;
  --color-shadows-of-time-200: #b0e1cd;
  --color-shadows-of-time-300: #8ac6af;
  --color-shadows-of-time-400: #68af93;
  --color-shadows-of-time-500: #429979;
  --color-shadows-of-time-600: #3a8167;
  --color-shadows-of-time-700: #2e6752;
  --color-shadows-of-time-800: #214c3a;
  --color-shadows-of-time-900: #163528;
  --color-shadows-of-time-950: #072016;
}

SCSS

$shadows-of-time: #358266;
$shadows-of-time-rgb: 53, 130, 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);
}