#5663C5

CSS

:root {
  --savoy-blue: #5663c5;
  --savoy-blue-rgb: 86 99 197;
  --savoy-blue-oklch: oklch(0.54 0.152 274.5);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(233 49% 55%);
  border-color: oklch(0.54 0.152 274.5);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5663c5;
  --color-savoy-blue-50: #e9f2ff;
  --color-savoy-blue-100: #dae4ff;
  --color-savoy-blue-200: #c3cfff;
  --color-savoy-blue-300: #a3b0ff;
  --color-savoy-blue-400: #8495f7;
  --color-savoy-blue-500: #6a7ae9;
  --color-savoy-blue-600: #5a67c4;
  --color-savoy-blue-700: #47539e;
  --color-savoy-blue-800: #313d76;
  --color-savoy-blue-900: #212a53;
  --color-savoy-blue-950: #111738;
}

SCSS

$savoy-blue: #5663c5;
$savoy-blue-rgb: 86, 99, 197;
$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);
}