#5E61C5

CSS

:root {
  --savoy-blue: #5e61c5;
  --savoy-blue-rgb: 94 97 197;
  --savoy-blue-oklch: oklch(0.541 0.152 278.7);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(238 47% 57%);
  border-color: oklch(0.541 0.152 278.7);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5e61c5;
  --color-savoy-blue-50: #ecf1ff;
  --color-savoy-blue-100: #dee3ff;
  --color-savoy-blue-200: #c8cdff;
  --color-savoy-blue-300: #a9aeff;
  --color-savoy-blue-400: #8c93f6;
  --color-savoy-blue-500: #7277e8;
  --color-savoy-blue-600: #6165c4;
  --color-savoy-blue-700: #4d519d;
  --color-savoy-blue-800: #363b76;
  --color-savoy-blue-900: #252953;
  --color-savoy-blue-950: #141638;
}

SCSS

$savoy-blue: #5e61c5;
$savoy-blue-rgb: 94, 97, 197;
$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);
}