#1D836D

CSS

:root {
  --shadows-of-time: #1d836d;
  --shadows-of-time-rgb: 29 131 109;
  --shadows-of-time-oklch: oklch(0.548 0.096 174.2);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(167 64% 31%);
  border-color: oklch(0.548 0.096 174.2);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #1d836d;
  --color-shadows-of-time-50: #dafff4;
  --color-shadows-of-time-100: #c7f3e7;
  --color-shadows-of-time-200: #a9e2d3;
  --color-shadows-of-time-300: #81c8b6;
  --color-shadows-of-time-400: #5bb19a;
  --color-shadows-of-time-500: #2a9b82;
  --color-shadows-of-time-600: #27836e;
  --color-shadows-of-time-700: #1f6958;
  --color-shadows-of-time-800: #164d3f;
  --color-shadows-of-time-900: #0e362b;
  --color-shadows-of-time-950: #012118;
}

SCSS

$shadows-of-time: #1d836d;
$shadows-of-time-rgb: 29, 131, 109;
$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);
}