#E8F5E9

CSS

:root {
  --polar: #e8f5e9;
  --polar-rgb: 232 245 233;
  --polar-oklch: oklch(0.957 0.021 147.6);
}

.element {
  color: var(--polar);
  background-color: hsl(125 39% 94%);
  border-color: oklch(0.957 0.021 147.6);
}

Tailwind CSS v4

@theme {
  --color-polar: #e8f5e9;
  --color-polar-50: #f1f7f2;
  --color-polar-100: #e3eae4;
  --color-polar-200: #ced7cf;
  --color-polar-300: #b0bbb2;
  --color-polar-400: #97a297;
  --color-polar-500: #7d8a7e;
  --color-polar-600: #6a756b;
  --color-polar-700: #555e56;
  --color-polar-800: #3e443e;
  --color-polar-900: #2b2f2b;
  --color-polar-950: #181c18;
}

SCSS

$polar: #e8f5e9;
$polar-rgb: 232, 245, 233;
$polar-light: mix(#fff, $polar, 20%);
$polar-dark: mix(#000, $polar, 20%);

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