#3F69C3

CSS

:root {
  --god-of-rain: #3f69c3;
  --god-of-rain-rgb: 63 105 195;
  --god-of-rain-oklch: oklch(0.538 0.148 263.4);
}

.element {
  color: var(--god-of-rain);
  background-color: hsl(221 52% 51%);
  border-color: oklch(0.538 0.148 263.4);
}

Tailwind CSS v4

@theme {
  --color-god-of-rain: #3f69c3;
  --color-god-of-rain-50: #e1f5ff;
  --color-god-of-rain-100: #d0e8ff;
  --color-god-of-rain-200: #b6d4ff;
  --color-god-of-rain-300: #93b6ff;
  --color-god-of-rain-400: #709cf6;
  --color-god-of-rain-500: #5181e7;
  --color-god-of-rain-600: #456dc3;
  --color-god-of-rain-700: #37589d;
  --color-god-of-rain-800: #244075;
  --color-god-of-rain-900: #182d53;
  --color-god-of-rain-950: #091937;
}

SCSS

$god-of-rain: #3f69c3;
$god-of-rain-rgb: 63, 105, 195;
$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);
}