Elusive Blue

CSS

:root {
  --elusive-blue: #dde4e8;
  --elusive-blue-rgb: 221 228 232;
  --elusive-blue-oklch: oklch(0.915 0.009 232.4);
}

.element {
  color: var(--elusive-blue);
  background-color: hsl(202 19% 89%);
  border-color: oklch(0.915 0.009 232.4);
}

Tailwind CSS v4

@theme {
  --color-elusive-blue: #dde4e8;
  --color-elusive-blue-50: #f3f6f7;
  --color-elusive-blue-100: #e5e8ea;
  --color-elusive-blue-200: #d0d5d8;
  --color-elusive-blue-300: #b3b8bb;
  --color-elusive-blue-400: #999fa3;
  --color-elusive-blue-500: #80878b;
  --color-elusive-blue-600: #6d7376;
  --color-elusive-blue-700: #575c5e;
  --color-elusive-blue-800: #3f4345;
  --color-elusive-blue-900: #2c2e30;
  --color-elusive-blue-950: #191b1c;
}

SCSS

$elusive-blue: #dde4e8;
$elusive-blue-rgb: 221, 228, 232;
$elusive-blue-light: mix(#fff, $elusive-blue, 20%);
$elusive-blue-dark: mix(#000, $elusive-blue, 20%);

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