#5E61C7

CSS

:root {
  --savoy-blue: #5e61c7;
  --savoy-blue-rgb: 94 97 199;
  --savoy-blue-oklch: oklch(0.543 0.155 278.6);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(238 48% 57%);
  border-color: oklch(0.543 0.155 278.6);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5e61c7;
  --color-savoy-blue-50: #ecf1ff;
  --color-savoy-blue-100: #dee3ff;
  --color-savoy-blue-200: #c7cdff;
  --color-savoy-blue-300: #a9aeff;
  --color-savoy-blue-400: #8b93f8;
  --color-savoy-blue-500: #7276ea;
  --color-savoy-blue-600: #6164c5;
  --color-savoy-blue-700: #4d509f;
  --color-savoy-blue-800: #363b77;
  --color-savoy-blue-900: #242954;
  --color-savoy-blue-950: #141638;
}

SCSS

$savoy-blue: #5e61c7;
$savoy-blue-rgb: 94, 97, 199;
$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);
}