#5964BF

CSS

:root {
  --savoy-blue: #5964bf;
  --savoy-blue-rgb: 89 100 191;
  --savoy-blue-oklch: oklch(0.54 0.141 275.4);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(234 44% 55%);
  border-color: oklch(0.54 0.141 275.4);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5964bf;
  --color-savoy-blue-50: #ebf2ff;
  --color-savoy-blue-100: #dce4ff;
  --color-savoy-blue-200: #c5cfff;
  --color-savoy-blue-300: #a6b0ff;
  --color-savoy-blue-400: #8796f1;
  --color-savoy-blue-500: #6d7be2;
  --color-savoy-blue-600: #5d68bf;
  --color-savoy-blue-700: #4a5399;
  --color-savoy-blue-800: #333d73;
  --color-savoy-blue-900: #232a51;
  --color-savoy-blue-950: #121736;
}

SCSS

$savoy-blue: #5964bf;
$savoy-blue-rgb: 89, 100, 191;
$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);
}