#5B60CC

CSS

:root {
  --savoy-blue: #5b60cc;
  --savoy-blue-rgb: 91 96 204;
  --savoy-blue-oklch: oklch(0.542 0.164 277.4);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(237 53% 58%);
  border-color: oklch(0.542 0.164 277.4);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5b60cc;
  --color-savoy-blue-50: #ebf1ff;
  --color-savoy-blue-100: #dce3ff;
  --color-savoy-blue-200: #c5cdff;
  --color-savoy-blue-300: #a6aeff;
  --color-savoy-blue-400: #8892fd;
  --color-savoy-blue-500: #6f75f0;
  --color-savoy-blue-600: #5e64ca;
  --color-savoy-blue-700: #4b50a3;
  --color-savoy-blue-800: #343b7a;
  --color-savoy-blue-900: #232856;
  --color-savoy-blue-950: #12163a;
}

SCSS

$savoy-blue: #5b60cc;
$savoy-blue-rgb: 91, 96, 204;
$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);
}