#DAE8D6

CSS

:root {
  --ghost-lichen: #dae8d6;
  --ghost-lichen-rgb: 218 232 214;
  --ghost-lichen-oklch: oklch(0.916 0.028 138.7);
}

.element {
  color: var(--ghost-lichen);
  background-color: hsl(107 28% 87%);
  border-color: oklch(0.916 0.028 138.7);
}

Tailwind CSS v4

@theme {
  --color-ghost-lichen: #dae8d6;
  --color-ghost-lichen-50: #f1f7f0;
  --color-ghost-lichen-100: #e3eae2;
  --color-ghost-lichen-200: #ced7cc;
  --color-ghost-lichen-300: #b0bbae;
  --color-ghost-lichen-400: #96a393;
  --color-ghost-lichen-500: #7d8b79;
  --color-ghost-lichen-600: #6a7667;
  --color-ghost-lichen-700: #555e52;
  --color-ghost-lichen-800: #3e453b;
  --color-ghost-lichen-900: #2b3029;
  --color-ghost-lichen-950: #181c16;
}

SCSS

$ghost-lichen: #dae8d6;
$ghost-lichen-rgb: 218, 232, 214;
$ghost-lichen-light: mix(#fff, $ghost-lichen, 20%);
$ghost-lichen-dark: mix(#000, $ghost-lichen, 20%);

.element {
  color: $ghost-lichen;
  box-shadow: 0 0 0 2px rgba($ghost-lichen, 0.35);
}