#D3DFEF

CSS

:root {
  --cold-shoulder: #d3dfef;
  --cold-shoulder-rgb: 211 223 239;
  --cold-shoulder-oklch: oklch(0.899 0.025 255.6);
}

.element {
  color: var(--cold-shoulder);
  background-color: hsl(214 47% 88%);
  border-color: oklch(0.899 0.025 255.6);
}

Tailwind CSS v4

@theme {
  --color-cold-shoulder: #d3dfef;
  --color-cold-shoulder-50: #f1f6fd;
  --color-cold-shoulder-100: #e3e8f1;
  --color-cold-shoulder-200: #ced5df;
  --color-cold-shoulder-300: #afb8c5;
  --color-cold-shoulder-400: #959fae;
  --color-cold-shoulder-500: #7b8797;
  --color-cold-shoulder-600: #687280;
  --color-cold-shoulder-700: #535c66;
  --color-cold-shoulder-800: #3c434b;
  --color-cold-shoulder-900: #292e34;
  --color-cold-shoulder-950: #171b20;
}

SCSS

$cold-shoulder: #d3dfef;
$cold-shoulder-rgb: 211, 223, 239;
$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);
}