#5171C6

CSS

:root {
  --god-of-rain: #5171c6;
  --god-of-rain-rgb: 81 113 198;
  --god-of-rain-oklch: oklch(0.566 0.137 266.6);
}

.element {
  color: var(--god-of-rain);
  background-color: hsl(224 51% 55%);
  border-color: oklch(0.566 0.137 266.6);
}

Tailwind CSS v4

@theme {
  --color-god-of-rain: #5171c6;
  --color-god-of-rain-50: #e5f5ff;
  --color-god-of-rain-100: #d5e7ff;
  --color-god-of-rain-200: #bcd3ff;
  --color-god-of-rain-300: #9ab5fe;
  --color-god-of-rain-400: #799bef;
  --color-god-of-rain-500: #5c80e0;
  --color-god-of-rain-600: #4f6dbd;
  --color-god-of-rain-700: #3e5798;
  --color-god-of-rain-800: #2a4071;
  --color-god-of-rain-900: #1c2c50;
  --color-god-of-rain-950: #0d1935;
}

SCSS

$god-of-rain: #5171c6;
$god-of-rain-rgb: 81, 113, 198;
$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);
}