#5A6ECC

CSS

:root {
  --god-of-rain: #5a6ecc;
  --god-of-rain-rgb: 90 110 204;
  --god-of-rain-oklch: oklch(0.569 0.146 272);
}

.element {
  color: var(--god-of-rain);
  background-color: hsl(229 53% 58%);
  border-color: oklch(0.569 0.146 272);
}

Tailwind CSS v4

@theme {
  --color-god-of-rain: #5a6ecc;
  --color-god-of-rain-50: #e8f3ff;
  --color-god-of-rain-100: #d8e5ff;
  --color-god-of-rain-200: #c0d0ff;
  --color-god-of-rain-300: #a0b2ff;
  --color-god-of-rain-400: #8197f4;
  --color-god-of-rain-500: #667ce6;
  --color-god-of-rain-600: #5669c2;
  --color-god-of-rain-700: #45549c;
  --color-god-of-rain-800: #2f3e74;
  --color-god-of-rain-900: #202b52;
  --color-god-of-rain-950: #101837;
}

SCSS

$god-of-rain: #5a6ecc;
$god-of-rain-rgb: 90, 110, 204;
$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);
}