#3666FF

CSS

:root {
  --secret-of-mana: #3666ff;
  --secret-of-mana-rgb: 54 102 255;
  --secret-of-mana-oklch: oklch(0.574 0.233 265.8);
}

.element {
  color: var(--secret-of-mana);
  background-color: hsl(226 100% 61%);
  border-color: oklch(0.574 0.233 265.8);
}

Tailwind CSS v4

@theme {
  --color-secret-of-mana: #3666ff;
  --color-secret-of-mana-50: #d8f4ff;
  --color-secret-of-mana-100: #c6e6ff;
  --color-secret-of-mana-200: #a9d0ff;
  --color-secret-of-mana-300: #84afff;
  --color-secret-of-mana-400: #5c92ff;
  --color-secret-of-mana-500: #3c71ff;
  --color-secret-of-mana-600: #3360f0;
  --color-secret-of-mana-700: #284dc1;
  --color-secret-of-mana-800: #153991;
  --color-secret-of-mana-900: #0d2767;
  --color-secret-of-mana-950: #031447;
}

SCSS

$secret-of-mana: #3666ff;
$secret-of-mana-rgb: 54, 102, 255;
$secret-of-mana-light: mix(#fff, $secret-of-mana, 20%);
$secret-of-mana-dark: mix(#000, $secret-of-mana, 20%);

.element {
  color: $secret-of-mana;
  box-shadow: 0 0 0 2px rgba($secret-of-mana, 0.35);
}