#19836B

CSS

:root {
  --shadows-of-time: #19836b;
  --shadows-of-time-rgb: 25 131 107;
  --shadows-of-time-oklch: oklch(0.547 0.099 172.9);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(166 68% 31%);
  border-color: oklch(0.547 0.099 172.9);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #19836b;
  --color-shadows-of-time-50: #d9fff3;
  --color-shadows-of-time-100: #c7f3e6;
  --color-shadows-of-time-200: #a8e3d2;
  --color-shadows-of-time-300: #7fc8b4;
  --color-shadows-of-time-400: #59b299;
  --color-shadows-of-time-500: #279b80;
  --color-shadows-of-time-600: #25836c;
  --color-shadows-of-time-700: #1d6956;
  --color-shadows-of-time-800: #154d3e;
  --color-shadows-of-time-900: #0d362a;
  --color-shadows-of-time-950: #012118;
}

SCSS

$shadows-of-time: #19836b;
$shadows-of-time-rgb: 25, 131, 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);
}