#5661CE

CSS

:root {
  --savoy-blue: #5661ce;
  --savoy-blue-rgb: 86 97 206;
  --savoy-blue-oklch: oklch(0.542 0.167 275);
}

.element {
  color: var(--savoy-blue);
  background-color: hsl(235 55% 57%);
  border-color: oklch(0.542 0.167 275);
}

Tailwind CSS v4

@theme {
  --color-savoy-blue: #5661ce;
  --color-savoy-blue-50: #e8f2ff;
  --color-savoy-blue-100: #d9e4ff;
  --color-savoy-blue-200: #c2ceff;
  --color-savoy-blue-300: #a2afff;
  --color-savoy-blue-400: #8393ff;
  --color-savoy-blue-500: #6977f2;
  --color-savoy-blue-600: #5965cc;
  --color-savoy-blue-700: #4751a4;
  --color-savoy-blue-800: #313b7b;
  --color-savoy-blue-900: #212957;
  --color-savoy-blue-950: #11163b;
}

SCSS

$savoy-blue: #5661ce;
$savoy-blue-rgb: 86, 97, 206;
$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);
}