#E1F0E7

CSS

:root {
  --polar: #e1f0e7;
  --polar-rgb: 225 240 231;
  --polar-oklch: oklch(0.941 0.02 159.7);
}

.element {
  color: var(--polar);
  background-color: hsl(144 33% 91%);
  border-color: oklch(0.941 0.02 159.7);
}

Tailwind CSS v4

@theme {
  --color-polar: #e1f0e7;
  --color-polar-50: #f0f7f3;
  --color-polar-100: #e2eae6;
  --color-polar-200: #cdd7d1;
  --color-polar-300: #afbbb4;
  --color-polar-400: #95a29a;
  --color-polar-500: #7b8a82;
  --color-polar-600: #69756e;
  --color-polar-700: #545e58;
  --color-polar-800: #3d4540;
  --color-polar-900: #2a2f2c;
  --color-polar-950: #171c19;
}

SCSS

$polar: #e1f0e7;
$polar-rgb: 225, 240, 231;
$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);
}