#E2EDF3

CSS

:root {
  --out-cold: #e2edf3;
  --out-cold-rgb: 226 237 243;
  --out-cold-oklch: oklch(0.94 0.014 231.2);
}

.element {
  color: var(--out-cold);
  background-color: hsl(201 41% 92%);
  border-color: oklch(0.94 0.014 231.2);
}

Tailwind CSS v4

@theme {
  --color-out-cold: #e2edf3;
  --color-out-cold-50: #f1f6f9;
  --color-out-cold-100: #e3e9ec;
  --color-out-cold-200: #cfd5d9;
  --color-out-cold-300: #b1b9be;
  --color-out-cold-400: #96a0a5;
  --color-out-cold-500: #7d888e;
  --color-out-cold-600: #6a7378;
  --color-out-cold-700: #555c60;
  --color-out-cold-800: #3e4346;
  --color-out-cold-900: #2a2f31;
  --color-out-cold-950: #181b1d;
}

SCSS

$out-cold: #e2edf3;
$out-cold-rgb: 226, 237, 243;
$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);
}