#3F8168

CSS

:root {
  --shadows-of-time: #3f8168;
  --shadows-of-time-rgb: 63 129 104;
  --shadows-of-time-oklch: oklch(0.552 0.079 166.5);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(157 34% 38%);
  border-color: oklch(0.552 0.079 166.5);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #3f8168;
  --color-shadows-of-time-50: #e0fdf1;
  --color-shadows-of-time-100: #d0f1e3;
  --color-shadows-of-time-200: #b4e0ce;
  --color-shadows-of-time-300: #90c5b0;
  --color-shadows-of-time-400: #6fae94;
  --color-shadows-of-time-500: #4d977b;
  --color-shadows-of-time-600: #428068;
  --color-shadows-of-time-700: #346653;
  --color-shadows-of-time-800: #264b3b;
  --color-shadows-of-time-900: #193429;
  --color-shadows-of-time-950: #091f17;
}

SCSS

$shadows-of-time: #3f8168;
$shadows-of-time-rgb: 63, 129, 104;
$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);
}