#4E63C3

CSS

:root {
  --savoy-blue: #4e63c3;
  --savoy-blue-rgb: 78 99 195;
  --savoy-blue-oklch: oklch(0.533 0.151 271.2);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(229 49% 54%);
  border-color: oklch(0.533 0.151 271.2);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #4e63c3;
  --color-savoy-blue-50: #e6f3ff;
  --color-savoy-blue-100: #d7e5ff;
  --color-savoy-blue-200: #bfd0ff;
  --color-savoy-blue-300: #9eb2ff;
  --color-savoy-blue-400: #7e97f7;
  --color-savoy-blue-500: #637ce9;
  --color-savoy-blue-600: #5469c4;
  --color-savoy-blue-700: #43549e;
  --color-savoy-blue-800: #2d3e76;
  --color-savoy-blue-900: #1f2b53;
  --color-savoy-blue-950: #0f1838;
}

SCSS

$savoy-blue: #4e63c3;
$savoy-blue-rgb: 78, 99, 195;
$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);
}