#606CCE

CSS

:root {
  --savoy-blue: #606cce;
  --savoy-blue-rgb: 96 108 206;
  --savoy-blue-oklch: oklch(0.57 0.15 275.3);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(233 53% 59%);
  border-color: oklch(0.57 0.15 275.3);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #606cce;
  --color-savoy-blue-50: #eaf2ff;
  --color-savoy-blue-100: #dbe4ff;
  --color-savoy-blue-200: #c4cfff;
  --color-savoy-blue-300: #a4b0ff;
  --color-savoy-blue-400: #8695f6;
  --color-savoy-blue-500: #6c79e7;
  --color-savoy-blue-600: #5b67c3;
  --color-savoy-blue-700: #49529d;
  --color-savoy-blue-800: #323c75;
  --color-savoy-blue-900: #222a53;
  --color-savoy-blue-950: #121738;
}

SCSS

$savoy-blue: #606cce;
$savoy-blue-rgb: 96, 108, 206;
$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);
}