#5464C3

CSS

:root {
  --savoy-blue: #5464c3;
  --savoy-blue-rgb: 84 100 195;
  --savoy-blue-oklch: oklch(0.539 0.148 273.2);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(231 48% 55%);
  border-color: oklch(0.539 0.148 273.2);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5464c3;
  --color-savoy-blue-50: #e8f3ff;
  --color-savoy-blue-100: #d9e5ff;
  --color-savoy-blue-200: #c2d0ff;
  --color-savoy-blue-300: #a2b1ff;
  --color-savoy-blue-400: #8396f5;
  --color-savoy-blue-500: #687be7;
  --color-savoy-blue-600: #5868c3;
  --color-savoy-blue-700: #46539c;
  --color-savoy-blue-800: #303d75;
  --color-savoy-blue-900: #212a53;
  --color-savoy-blue-950: #101737;
}

SCSS

$savoy-blue: #5464c3;
$savoy-blue-rgb: 84, 100, 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);
}