#3F8166

CSS

:root {
  --shadows-of-time: #3f8166;
  --shadows-of-time-rgb: 63 129 102;
  --shadows-of-time-oklch: oklch(0.552 0.081 164.7);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(155 34% 38%);
  border-color: oklch(0.552 0.081 164.7);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #3f8166;
  --color-shadows-of-time-50: #e0fdf0;
  --color-shadows-of-time-100: #d0f1e2;
  --color-shadows-of-time-200: #b4e0cd;
  --color-shadows-of-time-300: #90c5af;
  --color-shadows-of-time-400: #70ae92;
  --color-shadows-of-time-500: #4d9779;
  --color-shadows-of-time-600: #428066;
  --color-shadows-of-time-700: #356652;
  --color-shadows-of-time-800: #264b3a;
  --color-shadows-of-time-900: #193428;
  --color-shadows-of-time-950: #0a2016;
}

SCSS

$shadows-of-time: #3f8166;
$shadows-of-time-rgb: 63, 129, 102;
$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);
}