#5663C8

CSS

:root {
  --savoy-blue: #5663c8;
  --savoy-blue-rgb: 86 99 200;
  --savoy-blue-oklch: oklch(0.542 0.156 274.5);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(233 51% 56%);
  border-color: oklch(0.542 0.156 274.5);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5663c8;
  --color-savoy-blue-50: #e9f2ff;
  --color-savoy-blue-100: #dae4ff;
  --color-savoy-blue-200: #c2cfff;
  --color-savoy-blue-300: #a2b0ff;
  --color-savoy-blue-400: #8395f9;
  --color-savoy-blue-500: #6979eb;
  --color-savoy-blue-600: #5967c6;
  --color-savoy-blue-700: #4752a0;
  --color-savoy-blue-800: #313c78;
  --color-savoy-blue-900: #212a54;
  --color-savoy-blue-950: #111739;
}

SCSS

$savoy-blue: #5663c8;
$savoy-blue-rgb: 86, 99, 200;
$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);
}