#3F66BE

CSS

:root {
  --god-of-rain: #3f66be;
  --god-of-rain-rgb: 63 102 190;
  --god-of-rain-oklch: oklch(0.528 0.145 264.1);
}

.element {
  color: var(--god-of-rain);
  background-color: hsl(222 50% 50%);
  border-color: oklch(0.528 0.145 264.1);
}

Tailwind CSS v4

@theme {
  --color-god-of-rain: #3f66be;
  --color-god-of-rain-50: #e2f5ff;
  --color-god-of-rain-100: #d1e8ff;
  --color-god-of-rain-200: #b7d3ff;
  --color-god-of-rain-300: #95b5ff;
  --color-god-of-rain-400: #729cf4;
  --color-god-of-rain-500: #5481e5;
  --color-god-of-rain-600: #476dc1;
  --color-god-of-rain-700: #39589b;
  --color-god-of-rain-800: #254074;
  --color-god-of-rain-900: #192c52;
  --color-god-of-rain-950: #0a1937;
}

SCSS

$god-of-rain: #3f66be;
$god-of-rain-rgb: 63, 102, 190;
$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);
}