#D6ECF1

CSS

:root {
  --ice-cold: #d6ecf1;
  --ice-cold-rgb: 214 236 241;
  --ice-cold-oklch: oklch(0.928 0.024 212.9);
}

.element {
  color: var(--ice-cold);
  background-color: hsl(191 49% 89%);
  border-color: oklch(0.928 0.024 212.9);
}

Tailwind CSS v4

@theme {
  --color-ice-cold: #d6ecf1;
  --color-ice-cold-50: #eef7f9;
  --color-ice-cold-100: #dfeaed;
  --color-ice-cold-200: #c9d7db;
  --color-ice-cold-300: #aabbbf;
  --color-ice-cold-400: #8fa2a7;
  --color-ice-cold-500: #748b90;
  --color-ice-cold-600: #63757a;
  --color-ice-cold-700: #4f5e61;
  --color-ice-cold-800: #394547;
  --color-ice-cold-900: #273031;
  --color-ice-cold-950: #151c1d;
}

SCSS

$ice-cold: #d6ecf1;
$ice-cold-rgb: 214, 236, 241;
$ice-cold-light: mix(#fff, $ice-cold, 20%);
$ice-cold-dark: mix(#000, $ice-cold, 20%);

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