#5566BC

CSS

:root {
  --god-of-rain: #5566bc;
  --god-of-rain-rgb: 85 102 188;
  --god-of-rain-oklch: oklch(0.539 0.135 272.7);
}

.element {
  color: var(--god-of-rain);
  background-color: hsl(230 43% 54%);
  border-color: oklch(0.539 0.135 272.7);
}

Tailwind CSS v4

@theme {
  --color-god-of-rain: #5566bc;
  --color-god-of-rain-50: #e9f3ff;
  --color-god-of-rain-100: #dae5ff;
  --color-god-of-rain-200: #c3d0ff;
  --color-god-of-rain-300: #a3b2fd;
  --color-god-of-rain-400: #8498ee;
  --color-god-of-rain-500: #697ddf;
  --color-god-of-rain-600: #596abc;
  --color-god-of-rain-700: #475597;
  --color-god-of-rain-800: #313e71;
  --color-god-of-rain-900: #212b50;
  --color-god-of-rain-950: #111835;
}

SCSS

$god-of-rain: #5566bc;
$god-of-rain-rgb: 85, 102, 188;
$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);
}