Ruskin Blue

CSS

:root {
  --ruskin-blue: #546b75;
  --ruskin-blue-rgb: 84 107 117;
  --ruskin-blue-oklch: oklch(0.513 0.032 226.3);
}

.element {
  color: var(--ruskin-blue);
  background-color: hsl(198 16% 39%);
  border-color: oklch(0.513 0.032 226.3);
}

Tailwind CSS v4

@theme {
  --color-ruskin-blue: #546b75;
  --color-ruskin-blue-50: #ecf7fc;
  --color-ruskin-blue-100: #deeaf0;
  --color-ruskin-blue-200: #c7d7df;
  --color-ruskin-blue-300: #a8bbc4;
  --color-ruskin-blue-400: #8ca3ad;
  --color-ruskin-blue-500: #718b96;
  --color-ruskin-blue-600: #5f767f;
  --color-ruskin-blue-700: #4c5e66;
  --color-ruskin-blue-800: #37454b;
  --color-ruskin-blue-900: #253034;
  --color-ruskin-blue-950: #141c1f;
}

SCSS

$ruskin-blue: #546b75;
$ruskin-blue-rgb: 84, 107, 117;
$ruskin-blue-light: mix(#fff, $ruskin-blue, 20%);
$ruskin-blue-dark: mix(#000, $ruskin-blue, 20%);

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