#4663D6

CSS

:root {
  --savoy-blue: #4663d6;
  --savoy-blue-rgb: 70 99 214;
  --savoy-blue-oklch: oklch(0.542 0.179 269);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(228 64% 56%);
  border-color: oklch(0.542 0.179 269);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #4663d6;
  --color-savoy-blue-50: #e2f3ff;
  --color-savoy-blue-100: #d1e5ff;
  --color-savoy-blue-200: #b8d0ff;
  --color-savoy-blue-300: #96b1ff;
  --color-savoy-blue-400: #7396ff;
  --color-savoy-blue-500: #5779fb;
  --color-savoy-blue-600: #4a67d4;
  --color-savoy-blue-700: #3b52aa;
  --color-savoy-blue-800: #263d80;
  --color-savoy-blue-900: #192a5a;
  --color-savoy-blue-950: #0b173d;
}

SCSS

$savoy-blue: #4663d6;
$savoy-blue-rgb: 70, 99, 214;
$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);
}