#5961CA

CSS

:root {
  --savoy-blue: #5961ca;
  --savoy-blue-rgb: 89 97 202;
  --savoy-blue-oklch: oklch(0.541 0.16 276.3);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(236 52% 57%);
  border-color: oklch(0.541 0.16 276.3);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5961ca;
  --color-savoy-blue-50: #eaf1ff;
  --color-savoy-blue-100: #dbe3ff;
  --color-savoy-blue-200: #c4ceff;
  --color-savoy-blue-300: #a5aeff;
  --color-savoy-blue-400: #8693fc;
  --color-savoy-blue-500: #6d77ee;
  --color-savoy-blue-600: #5c65c9;
  --color-savoy-blue-700: #4951a1;
  --color-savoy-blue-800: #333b79;
  --color-savoy-blue-900: #222955;
  --color-savoy-blue-950: #12163a;
}

SCSS

$savoy-blue: #5961ca;
$savoy-blue-rgb: 89, 97, 202;
$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);
}