#606BD1

CSS

:root {
  --savoy-blue: #606bd1;
  --savoy-blue-rgb: 96 107 209;
  --savoy-blue-oklch: oklch(0.57 0.155 275.7);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(234 55% 60%);
  border-color: oklch(0.57 0.155 275.7);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #606bd1;
  --color-savoy-blue-50: #eaf2ff;
  --color-savoy-blue-100: #dbe4ff;
  --color-savoy-blue-200: #c4ceff;
  --color-savoy-blue-300: #a4afff;
  --color-savoy-blue-400: #8694f9;
  --color-savoy-blue-500: #6c78eb;
  --color-savoy-blue-600: #5b66c6;
  --color-savoy-blue-700: #49529f;
  --color-savoy-blue-800: #323c77;
  --color-savoy-blue-900: #222954;
  --color-savoy-blue-950: #121639;
}

SCSS

$savoy-blue: #606bd1;
$savoy-blue-rgb: 96, 107, 209;
$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);
}