#E51D13

CSS

:root {
  --red-wrath-of-zeus: #e51d13;
  --red-wrath-of-zeus-rgb: 229 29 19;
  --red-wrath-of-zeus-oklch: oklch(0.588 0.229 29.3);
}

.element {
  color: var(--red-wrath-of-zeus);
  background-color: hsl(3 85% 49%);
  border-color: oklch(0.588 0.229 29.3);
}

Tailwind CSS v4

@theme {
  --color-red-wrath-of-zeus: #e51d13;
  --color-red-wrath-of-zeus-50: #ffddcd;
  --color-red-wrath-of-zeus-100: #ffcbb9;
  --color-red-wrath-of-zeus-200: #ffad97;
  --color-red-wrath-of-zeus-300: #ff846b;
  --color-red-wrath-of-zeus-400: #ff5745;
  --color-red-wrath-of-zeus-500: #fa0a04;
  --color-red-wrath-of-zeus-600: #d3150c;
  --color-red-wrath-of-zeus-700: #aa120b;
  --color-red-wrath-of-zeus-800: #7f090c;
  --color-red-wrath-of-zeus-900: #5a0708;
  --color-red-wrath-of-zeus-950: #3d0000;
}

SCSS

$red-wrath-of-zeus: #e51d13;
$red-wrath-of-zeus-rgb: 229, 29, 19;
$red-wrath-of-zeus-light: mix(#fff, $red-wrath-of-zeus, 20%);
$red-wrath-of-zeus-dark: mix(#000, $red-wrath-of-zeus, 20%);

.element {
  color: $red-wrath-of-zeus;
  box-shadow: 0 0 0 2px rgba($red-wrath-of-zeus, 0.35);
}