#5764C2

CSS

:root {
  --savoy-blue: #5764c2;
  --savoy-blue-rgb: 87 100 194;
  --savoy-blue-oklch: oklch(0.54 0.146 274.5);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(233 47% 55%);
  border-color: oklch(0.54 0.146 274.5);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5764c2;
  --color-savoy-blue-50: #eaf2ff;
  --color-savoy-blue-100: #dae4ff;
  --color-savoy-blue-200: #c3cfff;
  --color-savoy-blue-300: #a4b0ff;
  --color-savoy-blue-400: #8596f4;
  --color-savoy-blue-500: #6b7ae5;
  --color-savoy-blue-600: #5b68c1;
  --color-savoy-blue-700: #48539b;
  --color-savoy-blue-800: #323d74;
  --color-savoy-blue-900: #222a52;
  --color-savoy-blue-950: #111737;
}

SCSS

$savoy-blue: #5764c2;
$savoy-blue-rgb: 87, 100, 194;
$savoy-blue-light: mix(#fff, $savoy-blue, 20%);
$savoy-blue-dark: mix(#000, $savoy-blue, 20%);

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