#5F6BD2

CSS

:root {
  --savoy-blue: #5f6bd2;
  --savoy-blue-rgb: 95 107 210;
  --savoy-blue-oklch: oklch(0.57 0.157 275.3);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(234 56% 60%);
  border-color: oklch(0.57 0.157 275.3);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5f6bd2;
  --color-savoy-blue-50: #e9f2ff;
  --color-savoy-blue-100: #dae4ff;
  --color-savoy-blue-200: #c3ceff;
  --color-savoy-blue-300: #a4afff;
  --color-savoy-blue-400: #8594fa;
  --color-savoy-blue-500: #6b78ec;
  --color-savoy-blue-600: #5b66c7;
  --color-savoy-blue-700: #4852a0;
  --color-savoy-blue-800: #323c78;
  --color-savoy-blue-900: #222955;
  --color-savoy-blue-950: #111639;
}

SCSS

$savoy-blue: #5f6bd2;
$savoy-blue-rgb: 95, 107, 210;
$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);
}