#3F65D1

CSS

:root {
  --god-of-rain: #3f65d1;
  --god-of-rain-rgb: 63 101 209;
  --god-of-rain-oklch: oklch(0.539 0.172 266.1);
}

.element {
  color: var(--god-of-rain);
  background-color: hsl(224 61% 53%);
  border-color: oklch(0.539 0.172 266.1);
}

Tailwind CSS v4

@theme {
  --color-god-of-rain: #3f65d1;
  --color-god-of-rain-50: #e0f4ff;
  --color-god-of-rain-100: #cfe7ff;
  --color-god-of-rain-200: #b5d2ff;
  --color-god-of-rain-300: #92b3ff;
  --color-god-of-rain-400: #6e98ff;
  --color-god-of-rain-500: #507cf7;
  --color-god-of-rain-600: #4469d0;
  --color-god-of-rain-700: #3654a7;
  --color-god-of-rain-800: #233e7d;
  --color-god-of-rain-900: #172b58;
  --color-god-of-rain-950: #08183c;
}

SCSS

$god-of-rain: #3f65d1;
$god-of-rain-rgb: 63, 101, 209;
$god-of-rain-light: mix(#fff, $god-of-rain, 20%);
$god-of-rain-dark: mix(#000, $god-of-rain, 20%);

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