#3666D3

CSS

:root {
  --god-of-rain: #3666d3;
  --god-of-rain-rgb: 54 102 211;
  --god-of-rain-oklch: oklch(0.539 0.176 263.7);
}

.element {
  color: var(--god-of-rain);
  background-color: hsl(222 64% 52%);
  border-color: oklch(0.539 0.176 263.7);
}

Tailwind CSS v4

@theme {
  --color-god-of-rain: #3666d3;
  --color-god-of-rain-50: #ddf5ff;
  --color-god-of-rain-100: #cce7ff;
  --color-god-of-rain-200: #b0d3ff;
  --color-god-of-rain-300: #8cb4ff;
  --color-god-of-rain-400: #679aff;
  --color-god-of-rain-500: #467df9;
  --color-god-of-rain-600: #3c6bd2;
  --color-god-of-rain-700: #3055a9;
  --color-god-of-rain-800: #1d3f7e;
  --color-god-of-rain-900: #132b59;
  --color-god-of-rain-950: #06183d;
}

SCSS

$god-of-rain: #3666d3;
$god-of-rain-rgb: 54, 102, 211;
$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);
}