#D9E4F5

CSS

:root {
  --cold-shoulder: #d9e4f5;
  --cold-shoulder-rgb: 217 228 245;
  --cold-shoulder-oklch: oklch(0.916 0.026 259);
}

.element {
  color: var(--cold-shoulder);
  background-color: hsl(216 58% 91%);
  border-color: oklch(0.916 0.026 259);
}

Tailwind CSS v4

@theme {
  --color-cold-shoulder: #d9e4f5;
  --color-cold-shoulder-50: #f1f5fd;
  --color-cold-shoulder-100: #e3e8f1;
  --color-cold-shoulder-200: #ced5e0;
  --color-cold-shoulder-300: #b0b8c5;
  --color-cold-shoulder-400: #959fae;
  --color-cold-shoulder-500: #7c8798;
  --color-cold-shoulder-600: #697280;
  --color-cold-shoulder-700: #545b67;
  --color-cold-shoulder-800: #3d434c;
  --color-cold-shoulder-900: #2a2e34;
  --color-cold-shoulder-950: #171b20;
}

SCSS

$cold-shoulder: #d9e4f5;
$cold-shoulder-rgb: 217, 228, 245;
$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);
}