#5F61C4

CSS

:root {
  --savoy-blue: #5f61c4;
  --savoy-blue-rgb: 95 97 196;
  --savoy-blue-oklch: oklch(0.541 0.151 279.2);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(239 46% 57%);
  border-color: oklch(0.541 0.151 279.2);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5f61c4;
  --color-savoy-blue-50: #edf1ff;
  --color-savoy-blue-100: #dee3ff;
  --color-savoy-blue-200: #c8cdff;
  --color-savoy-blue-300: #aaaeff;
  --color-savoy-blue-400: #8d93f5;
  --color-savoy-blue-500: #7477e7;
  --color-savoy-blue-600: #6265c3;
  --color-savoy-blue-700: #4e519d;
  --color-savoy-blue-800: #363b75;
  --color-savoy-blue-900: #252953;
  --color-savoy-blue-950: #141638;
}

SCSS

$savoy-blue: #5f61c4;
$savoy-blue-rgb: 95, 97, 196;
$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);
}