#5165C5

CSS

:root {
  --savoy-blue: #5165c5;
  --savoy-blue-rgb: 81 101 197;
  --savoy-blue-oklch: oklch(0.54 0.15 271.7);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(230 50% 55%);
  border-color: oklch(0.54 0.15 271.7);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5165c5;
  --color-savoy-blue-50: #e7f3ff;
  --color-savoy-blue-100: #d7e5ff;
  --color-savoy-blue-200: #bfd0ff;
  --color-savoy-blue-300: #9fb2ff;
  --color-savoy-blue-400: #7f97f7;
  --color-savoy-blue-500: #647ce8;
  --color-savoy-blue-600: #5569c4;
  --color-savoy-blue-700: #44549e;
  --color-savoy-blue-800: #2e3e76;
  --color-savoy-blue-900: #1f2a53;
  --color-savoy-blue-950: #0f1738;
}

SCSS

$savoy-blue: #5165c5;
$savoy-blue-rgb: 81, 101, 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);
}