#3F66CD

CSS

:root {
  --god-of-rain: #3f66cd;
  --god-of-rain-rgb: 63 102 205;
  --god-of-rain-oklch: oklch(0.538 0.166 265.5);
}

.element {
  color: var(--god-of-rain);
  background-color: hsl(224 59% 53%);
  border-color: oklch(0.538 0.166 265.5);
}

Tailwind CSS v4

@theme {
  --color-god-of-rain: #3f66cd;
  --color-god-of-rain-50: #e0f5ff;
  --color-god-of-rain-100: #d0e7ff;
  --color-god-of-rain-200: #b5d2ff;
  --color-god-of-rain-300: #92b4ff;
  --color-god-of-rain-400: #6f99ff;
  --color-god-of-rain-500: #507ef2;
  --color-god-of-rain-600: #456bcc;
  --color-god-of-rain-700: #3655a4;
  --color-god-of-rain-800: #233f7b;
  --color-god-of-rain-900: #172b57;
  --color-god-of-rain-950: #09183b;
}

SCSS

$god-of-rain: #3f66cd;
$god-of-rain-rgb: 63, 102, 205;
$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);
}