#5365C3

CSS

:root {
  --savoy-blue: #5365c3;
  --savoy-blue-rgb: 83 101 195;
  --savoy-blue-oklch: oklch(0.54 0.147 272.4);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(230 48% 55%);
  border-color: oklch(0.54 0.147 272.4);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5365c3;
  --color-savoy-blue-50: #e8f3ff;
  --color-savoy-blue-100: #d8e5ff;
  --color-savoy-blue-200: #c1d0ff;
  --color-savoy-blue-300: #a1b1ff;
  --color-savoy-blue-400: #8197f5;
  --color-savoy-blue-500: #667ce6;
  --color-savoy-blue-600: #5769c2;
  --color-savoy-blue-700: #45549c;
  --color-savoy-blue-800: #2f3e75;
  --color-savoy-blue-900: #202a52;
  --color-savoy-blue-950: #101737;
}

SCSS

$savoy-blue: #5365c3;
$savoy-blue-rgb: 83, 101, 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);
}