#398264

CSS

:root {
  --shadows-of-time: #398264;
  --shadows-of-time-rgb: 57 130 100;
  --shadows-of-time-oklch: oklch(0.551 0.088 163.9);
}

.element {
  color: var(--shadows-of-time);
  background-color: hsl(155 39% 37%);
  border-color: oklch(0.551 0.088 163.9);
}

Tailwind CSS v4

@theme {
  --color-shadows-of-time: #398264;
  --color-shadows-of-time-50: #dffeef;
  --color-shadows-of-time-100: #cef2e1;
  --color-shadows-of-time-200: #b2e1cc;
  --color-shadows-of-time-300: #8cc6ad;
  --color-shadows-of-time-400: #6baf91;
  --color-shadows-of-time-500: #469876;
  --color-shadows-of-time-600: #3d8164;
  --color-shadows-of-time-700: #306750;
  --color-shadows-of-time-800: #234c39;
  --color-shadows-of-time-900: #173527;
  --color-shadows-of-time-950: #082015;
}

SCSS

$shadows-of-time: #398264;
$shadows-of-time-rgb: 57, 130, 100;
$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);
}