#4563D5

CSS

:root {
  --savoy-blue: #4563d5;
  --savoy-blue-rgb: 69 99 213;
  --savoy-blue-oklch: oklch(0.541 0.178 268.7);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(228 63% 55%);
  border-color: oklch(0.541 0.178 268.7);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #4563d5;
  --color-savoy-blue-50: #e2f3ff;
  --color-savoy-blue-100: #d1e6ff;
  --color-savoy-blue-200: #b7d0ff;
  --color-savoy-blue-300: #95b1ff;
  --color-savoy-blue-400: #7396ff;
  --color-savoy-blue-500: #5679fa;
  --color-savoy-blue-600: #4967d3;
  --color-savoy-blue-700: #3a53aa;
  --color-savoy-blue-800: #263d7f;
  --color-savoy-blue-900: #192a5a;
  --color-savoy-blue-950: #0a173d;
}

SCSS

$savoy-blue: #4563d5;
$savoy-blue-rgb: 69, 99, 213;
$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);
}