#5E63C0

CSS

:root {
  --savoy-blue: #5e63c0;
  --savoy-blue-rgb: 94 99 192;
  --savoy-blue-oklch: oklch(0.542 0.143 278.2);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(237 44% 56%);
  border-color: oklch(0.542 0.143 278.2);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5e63c0;
  --color-savoy-blue-50: #ecf2ff;
  --color-savoy-blue-100: #dee3ff;
  --color-savoy-blue-200: #c8ceff;
  --color-savoy-blue-300: #a9afff;
  --color-savoy-blue-400: #8c94f1;
  --color-savoy-blue-500: #7279e2;
  --color-savoy-blue-600: #6166bf;
  --color-savoy-blue-700: #4d5299;
  --color-savoy-blue-800: #363c73;
  --color-savoy-blue-900: #252951;
  --color-savoy-blue-950: #141736;
}

SCSS

$savoy-blue: #5e63c0;
$savoy-blue-rgb: 94, 99, 192;
$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);
}