#4E63CF

CSS

:root {
  --savoy-blue: #4e63cf;
  --savoy-blue-rgb: 78 99 207;
  --savoy-blue-oklch: oklch(0.542 0.168 271.4);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(230 57% 56%);
  border-color: oklch(0.542 0.168 271.4);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #4e63cf;
  --color-savoy-blue-50: #e5f3ff;
  --color-savoy-blue-100: #d5e5ff;
  --color-savoy-blue-200: #bdd0ff;
  --color-savoy-blue-300: #9cb0ff;
  --color-savoy-blue-400: #7b96ff;
  --color-savoy-blue-500: #6079f3;
  --color-savoy-blue-600: #5267cd;
  --color-savoy-blue-700: #4152a5;
  --color-savoy-blue-800: #2c3c7c;
  --color-savoy-blue-900: #1d2a57;
  --color-savoy-blue-950: #0e173b;
}

SCSS

$savoy-blue: #4e63cf;
$savoy-blue-rgb: 78, 99, 207;
$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);
}