#5B64BF

CSS

:root {
  --savoy-blue: #5b64bf;
  --savoy-blue-rgb: 91 100 191;
  --savoy-blue-oklch: oklch(0.541 0.141 276.4);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(235 44% 55%);
  border-color: oklch(0.541 0.141 276.4);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5b64bf;
  --color-savoy-blue-50: #ebf2ff;
  --color-savoy-blue-100: #dde4ff;
  --color-savoy-blue-200: #c6cfff;
  --color-savoy-blue-300: #a7b0ff;
  --color-savoy-blue-400: #8996f0;
  --color-savoy-blue-500: #6f7ae1;
  --color-savoy-blue-600: #5e68be;
  --color-savoy-blue-700: #4b5399;
  --color-savoy-blue-800: #343d72;
  --color-savoy-blue-900: #242a51;
  --color-savoy-blue-950: #131736;
}

SCSS

$savoy-blue: #5b64bf;
$savoy-blue-rgb: 91, 100, 191;
$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);
}