#575CC7

CSS

:root {
  --savoy-blue: #575cc7;
  --savoy-blue-rgb: 87 92 199;
  --savoy-blue-oklch: oklch(0.528 0.163 277.2);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(237 50% 56%);
  border-color: oklch(0.528 0.163 277.2);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #575cc7;
  --color-savoy-blue-50: #ebf1ff;
  --color-savoy-blue-100: #dce3ff;
  --color-savoy-blue-200: #c5cdff;
  --color-savoy-blue-300: #a6aeff;
  --color-savoy-blue-400: #8893fd;
  --color-savoy-blue-500: #6e76ef;
  --color-savoy-blue-600: #5d64ca;
  --color-savoy-blue-700: #4a50a2;
  --color-savoy-blue-800: #333b7a;
  --color-savoy-blue-900: #232856;
  --color-savoy-blue-950: #12163a;
}

SCSS

$savoy-blue: #575cc7;
$savoy-blue-rgb: 87, 92, 199;
$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);
}