#4161DF

CSS

:root {
  --savoy-blue: #4161df;
  --savoy-blue-rgb: 65 97 223;
  --savoy-blue-oklch: oklch(0.543 0.195 268.3);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(228 71% 56%);
  border-color: oklch(0.543 0.195 268.3);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #4161df;
  --color-savoy-blue-50: #dff3ff;
  --color-savoy-blue-100: #cfe5ff;
  --color-savoy-blue-200: #b4d0ff;
  --color-savoy-blue-300: #91b0ff;
  --color-savoy-blue-400: #6e95ff;
  --color-savoy-blue-500: #5177ff;
  --color-savoy-blue-600: #4565dc;
  --color-savoy-blue-700: #3751b1;
  --color-savoy-blue-800: #233b85;
  --color-savoy-blue-900: #17295e;
  --color-savoy-blue-950: #091640;
}

SCSS

$savoy-blue: #4161df;
$savoy-blue-rgb: 65, 97, 223;
$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);
}