#3B66FF

CSS

:root {
  --secret-of-mana: #3b66ff;
  --secret-of-mana-rgb: 59 102 255;
  --secret-of-mana-oklch: oklch(0.575 0.232 266.7);
}

.element {
  color: var(--secret-of-mana);
  background-color: hsl(227 100% 62%);
  border-color: oklch(0.575 0.232 266.7);
}

Tailwind CSS v4

@theme {
  --color-secret-of-mana: #3b66ff;
  --color-secret-of-mana-50: #d9f3ff;
  --color-secret-of-mana-100: #c8e5ff;
  --color-secret-of-mana-200: #abcfff;
  --color-secret-of-mana-300: #87aeff;
  --color-secret-of-mana-400: #6091ff;
  --color-secret-of-mana-500: #4170ff;
  --color-secret-of-mana-600: #3760ef;
  --color-secret-of-mana-700: #2c4dc1;
  --color-secret-of-mana-800: #183991;
  --color-secret-of-mana-900: #0f2767;
  --color-secret-of-mana-950: #041447;
}

SCSS

$secret-of-mana: #3b66ff;
$secret-of-mana-rgb: 59, 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);
}