#D6ECF3

CSS

:root {
  --ice-cold: #d6ecf3;
  --ice-cold-rgb: 214 236 243;
  --ice-cold-oklch: oklch(0.929 0.025 218.8);
}

.element {
  color: var(--ice-cold);
  background-color: hsl(194 55% 90%);
  border-color: oklch(0.929 0.025 218.8);
}

Tailwind CSS v4

@theme {
  --color-ice-cold: #d6ecf3;
  --color-ice-cold-50: #eef7fa;
  --color-ice-cold-100: #dfeaee;
  --color-ice-cold-200: #c9d7dc;
  --color-ice-cold-300: #aabbc0;
  --color-ice-cold-400: #8fa2a9;
  --color-ice-cold-500: #748b92;
  --color-ice-cold-600: #63757b;
  --color-ice-cold-700: #4f5e63;
  --color-ice-cold-800: #394548;
  --color-ice-cold-900: #272f32;
  --color-ice-cold-950: #151c1e;
}

SCSS

$ice-cold: #d6ecf3;
$ice-cold-rgb: 214, 236, 243;
$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);
}