#3968CA

CSS

:root {
  --god-of-rain: #3968ca;
  --god-of-rain-rgb: 57 104 202;
  --god-of-rain-oklch: oklch(0.538 0.161 262.9);
}

.element {
  color: var(--god-of-rain);
  background-color: hsl(221 58% 51%);
  border-color: oklch(0.538 0.161 262.9);
}

Tailwind CSS v4

@theme {
  --color-god-of-rain: #3968ca;
  --color-god-of-rain-50: #dff5ff;
  --color-god-of-rain-100: #cee8ff;
  --color-god-of-rain-200: #b3d4ff;
  --color-god-of-rain-300: #8fb5ff;
  --color-god-of-rain-400: #6a9bfd;
  --color-god-of-rain-500: #4a80ef;
  --color-god-of-rain-600: #3f6dca;
  --color-god-of-rain-700: #3257a2;
  --color-god-of-rain-800: #204079;
  --color-god-of-rain-900: #152c56;
  --color-god-of-rain-950: #07193a;
}

SCSS

$god-of-rain: #3968ca;
$god-of-rain-rgb: 57, 104, 202;
$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);
}