#D6E4E3

CSS

:root {
  --icelandic-winter: #d6e4e3;
  --icelandic-winter-rgb: 214 228 227;
  --icelandic-winter-oklch: oklch(0.908 0.015 191.7);
}

.element {
  color: var(--icelandic-winter);
  background-color: hsl(176 21% 87%);
  border-color: oklch(0.908 0.015 191.7);
}

Tailwind CSS v4

@theme {
  --color-icelandic-winter: #d6e4e3;
  --color-icelandic-winter-50: #f0f6f6;
  --color-icelandic-winter-100: #e2e9e9;
  --color-icelandic-winter-200: #cdd6d6;
  --color-icelandic-winter-300: #afbab9;
  --color-icelandic-winter-400: #95a1a1;
  --color-icelandic-winter-500: #7b8a89;
  --color-icelandic-winter-600: #697474;
  --color-icelandic-winter-700: #535d5c;
  --color-icelandic-winter-800: #3d4443;
  --color-icelandic-winter-900: #2a2f2f;
  --color-icelandic-winter-950: #171c1b;
}

SCSS

$icelandic-winter: #d6e4e3;
$icelandic-winter-rgb: 214, 228, 227;
$icelandic-winter-light: mix(#fff, $icelandic-winter, 20%);
$icelandic-winter-dark: mix(#000, $icelandic-winter, 20%);

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