#4263D9

CSS

:root {
  --savoy-blue: #4263d9;
  --savoy-blue-rgb: 66 99 217;
  --savoy-blue-oklch: oklch(0.543 0.185 267.9);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(227 67% 55%);
  border-color: oklch(0.543 0.185 267.9);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #4263d9;
  --color-savoy-blue-50: #e0f4ff;
  --color-savoy-blue-100: #d0e6ff;
  --color-savoy-blue-200: #b5d1ff;
  --color-savoy-blue-300: #93b1ff;
  --color-savoy-blue-400: #7096ff;
  --color-savoy-blue-500: #5279fe;
  --color-savoy-blue-600: #4667d6;
  --color-savoy-blue-700: #3852ac;
  --color-savoy-blue-800: #243d81;
  --color-savoy-blue-900: #182a5b;
  --color-savoy-blue-950: #09173e;
}

SCSS

$savoy-blue: #4263d9;
$savoy-blue-rgb: 66, 99, 217;
$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);
}