#00866B

CSS

:root {
  --shadows-of-time: #00866b;
  --shadows-of-time-rgb: 0 134 107;
  --shadows-of-time-oklch: oklch(0.552 0.107 172);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(168 100% 26%);
  border-color: oklch(0.552 0.107 172);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #00866b;
  --color-shadows-of-time-50: #d7fff3;
  --color-shadows-of-time-100: #c4f4e5;
  --color-shadows-of-time-200: #a4e4d1;
  --color-shadows-of-time-300: #7acab3;
  --color-shadows-of-time-400: #51b397;
  --color-shadows-of-time-500: #0e9d7e;
  --color-shadows-of-time-600: #15846b;
  --color-shadows-of-time-700: #126a55;
  --color-shadows-of-time-800: #0d4e3d;
  --color-shadows-of-time-900: #08362a;
  --color-shadows-of-time-950: #002117;
}

SCSS

$shadows-of-time: #00866b;
$shadows-of-time-rgb: 0, 134, 107;
$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);
}