#3F65FF

CSS

:root {
  --secret-of-mana: #3f65ff;
  --secret-of-mana-rgb: 63 101 255;
  --secret-of-mana-oklch: oklch(0.575 0.232 267.6);
}

.element {
  color: var(--secret-of-mana);
  background-color: hsl(228 100% 62%);
  border-color: oklch(0.575 0.232 267.6);
}

Tailwind CSS v4

@theme {
  --color-secret-of-mana: #3f65ff;
  --color-secret-of-mana-50: #daf3ff;
  --color-secret-of-mana-100: #c9e5ff;
  --color-secret-of-mana-200: #adcfff;
  --color-secret-of-mana-300: #89aeff;
  --color-secret-of-mana-400: #6391ff;
  --color-secret-of-mana-500: #456fff;
  --color-secret-of-mana-600: #3b5ff0;
  --color-secret-of-mana-700: #2f4cc1;
  --color-secret-of-mana-800: #1b3891;
  --color-secret-of-mana-900: #112767;
  --color-secret-of-mana-950: #051347;
}

SCSS

$secret-of-mana: #3f65ff;
$secret-of-mana-rgb: 63, 101, 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);
}