#16866B

CSS

:root {
  --shadows-of-time: #16866b;
  --shadows-of-time-rgb: 22 134 107;
  --shadows-of-time-oklch: oklch(0.555 0.103 171.2);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(166 72% 31%);
  border-color: oklch(0.555 0.103 171.2);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #16866b;
  --color-shadows-of-time-50: #d8fff2;
  --color-shadows-of-time-100: #c6f4e5;
  --color-shadows-of-time-200: #a7e3d0;
  --color-shadows-of-time-300: #7dc9b3;
  --color-shadows-of-time-400: #56b296;
  --color-shadows-of-time-500: #209c7d;
  --color-shadows-of-time-600: #20846a;
  --color-shadows-of-time-700: #1a6a55;
  --color-shadows-of-time-800: #124e3c;
  --color-shadows-of-time-900: #0c3629;
  --color-shadows-of-time-950: #002117;
}

SCSS

$shadows-of-time: #16866b;
$shadows-of-time-rgb: 22, 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);
}