#067B63

CSS

:root {
  --tropical-rainforest: #067b63;
  --tropical-rainforest-rgb: 6 123 99;
  --tropical-rainforest-oklch: oklch(0.52 0.099 172.6);
}

.element {
  color: var(--tropical-rainforest);
  background-color: hsl(168 91% 25%);
  border-color: oklch(0.52 0.099 172.6);
}

Tailwind CSS v4

@theme {
  --color-tropical-rainforest: #067b63;
  --color-tropical-rainforest-50: #d9fff3;
  --color-tropical-rainforest-100: #c7f3e6;
  --color-tropical-rainforest-200: #a8e3d1;
  --color-tropical-rainforest-300: #7fc8b4;
  --color-tropical-rainforest-400: #59b298;
  --color-tropical-rainforest-500: #279b7f;
  --color-tropical-rainforest-600: #24836c;
  --color-tropical-rainforest-700: #1d6956;
  --color-tropical-rainforest-800: #154d3d;
  --color-tropical-rainforest-900: #0d362a;
  --color-tropical-rainforest-950: #012118;
}

SCSS

$tropical-rainforest: #067b63;
$tropical-rainforest-rgb: 6, 123, 99;
$tropical-rainforest-light: mix(#fff, $tropical-rainforest, 20%);
$tropical-rainforest-dark: mix(#000, $tropical-rainforest, 20%);

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