Blue Stone

CSS

:root {
  --blue-stone: #577284;
  --blue-stone-rgb: 87 114 132;
  --blue-stone-oklch: oklch(0.538 0.042 237.8);
}

.element {
  color: var(--blue-stone);
  background-color: hsl(204 21% 43%);
  border-color: oklch(0.538 0.042 237.8);
}

Tailwind CSS v4

@theme {
  --color-blue-stone: #577284;
  --color-blue-stone-50: #ebf7ff;
  --color-blue-stone-100: #dceaf5;
  --color-blue-stone-200: #c5d7e5;
  --color-blue-stone-300: #a5bbcb;
  --color-blue-stone-400: #88a3b5;
  --color-blue-stone-500: #6c8b9f;
  --color-blue-stone-600: #5c7587;
  --color-blue-stone-700: #495e6c;
  --color-blue-stone-800: #34454f;
  --color-blue-stone-900: #243037;
  --color-blue-stone-950: #121c22;
}

SCSS

$blue-stone: #577284;
$blue-stone-rgb: 87, 114, 132;
$blue-stone-light: mix(#fff, $blue-stone, 20%);
$blue-stone-dark: mix(#000, $blue-stone, 20%);

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