#D6E5F6

CSS

:root {
  --cold-shoulder: #d6e5f6;
  --cold-shoulder-rgb: 214 229 246;
  --cold-shoulder-oklch: oklch(0.916 0.028 251.5);
}

.element {
  color: var(--cold-shoulder);
  background-color: hsl(212 64% 90%);
  border-color: oklch(0.916 0.028 251.5);
}

Tailwind CSS v4

@theme {
  --color-cold-shoulder: #d6e5f6;
  --color-cold-shoulder-50: #f0f6fd;
  --color-cold-shoulder-100: #e1e9f1;
  --color-cold-shoulder-200: #ccd5e0;
  --color-cold-shoulder-300: #aeb9c6;
  --color-cold-shoulder-400: #93a0af;
  --color-cold-shoulder-500: #798899;
  --color-cold-shoulder-600: #667381;
  --color-cold-shoulder-700: #525c67;
  --color-cold-shoulder-800: #3b434c;
  --color-cold-shoulder-900: #292f35;
  --color-cold-shoulder-950: #161b20;
}

SCSS

$cold-shoulder: #d6e5f6;
$cold-shoulder-rgb: 214, 229, 246;
$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);
}