#D4E1F2

CSS

:root {
  --cold-shoulder: #d4e1f2;
  --cold-shoulder-rgb: 212 225 242;
  --cold-shoulder-oklch: oklch(0.905 0.027 255.1);
}

.element {
  color: var(--cold-shoulder);
  background-color: hsl(214 54% 89%);
  border-color: oklch(0.905 0.027 255.1);
}

Tailwind CSS v4

@theme {
  --color-cold-shoulder: #d4e1f2;
  --color-cold-shoulder-50: #f0f6fd;
  --color-cold-shoulder-100: #e2e8f1;
  --color-cold-shoulder-200: #cdd5e0;
  --color-cold-shoulder-300: #afb8c6;
  --color-cold-shoulder-400: #94a0af;
  --color-cold-shoulder-500: #7a8798;
  --color-cold-shoulder-600: #687381;
  --color-cold-shoulder-700: #535c67;
  --color-cold-shoulder-800: #3c434c;
  --color-cold-shoulder-900: #292e35;
  --color-cold-shoulder-950: #171b20;
}

SCSS

$cold-shoulder: #d4e1f2;
$cold-shoulder-rgb: 212, 225, 242;
$cold-shoulder-light: mix(#fff, $cold-shoulder, 20%);
$cold-shoulder-dark: mix(#000, $cold-shoulder, 20%);

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