#B5CBAD

CSS

:root {
  --nature: #b5cbad;
  --nature-rgb: 181 203 173;
  --nature-oklch: oklch(0.817 0.048 137.3);
}

.element {
  color: var(--nature);
  background-color: hsl(104 22% 74%);
  border-color: oklch(0.817 0.048 137.3);
}

Tailwind CSS v4

@theme {
  --color-nature: #b5cbad;
  --color-nature-50: #eef9ec;
  --color-nature-100: #e0ecdd;
  --color-nature-200: #cadac6;
  --color-nature-300: #abbea7;
  --color-nature-400: #91a58a;
  --color-nature-500: #778e6f;
  --color-nature-600: #65785e;
  --color-nature-700: #51604b;
  --color-nature-800: #3b4636;
  --color-nature-900: #293125;
  --color-nature-950: #161d13;
}

SCSS

$nature: #b5cbad;
$nature-rgb: 181, 203, 173;
$nature-light: mix(#fff, $nature, 20%);
$nature-dark: mix(#000, $nature, 20%);

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