#E8F5FF

CSS

:root {
  --out-cold: #e8f5ff;
  --out-cold-rgb: 232 245 255;
  --out-cold-oklch: oklch(0.963 0.019 240.7);
}

.element {
  color: var(--out-cold);
  background-color: hsl(206 100% 95%);
  border-color: oklch(0.963 0.019 240.7);
}

Tailwind CSS v4

@theme {
  --color-out-cold: #e8f5ff;
  --color-out-cold-50: #f1f6fa;
  --color-out-cold-100: #e3e9ee;
  --color-out-cold-200: #cdd5dc;
  --color-out-cold-300: #afb9c1;
  --color-out-cold-400: #95a0a9;
  --color-out-cold-500: #7b8892;
  --color-out-cold-600: #68737b;
  --color-out-cold-700: #535c63;
  --color-out-cold-800: #3c4348;
  --color-out-cold-900: #2a2f32;
  --color-out-cold-950: #171b1e;
}

SCSS

$out-cold: #e8f5ff;
$out-cold-rgb: 232, 245, 255;
$out-cold-light: mix(#fff, $out-cold, 20%);
$out-cold-dark: mix(#000, $out-cold, 20%);

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