#E51E14

CSS

:root {
  --miyamoto-red: #e51e14;
  --miyamoto-red-rgb: 229 30 20;
  --miyamoto-red-oklch: oklch(0.588 0.228 29.3);
}

.element {
  color: var(--miyamoto-red);
  background-color: hsl(3 84% 49%);
  border-color: oklch(0.588 0.228 29.3);
}

Tailwind CSS v4

@theme {
  --color-miyamoto-red: #e51e14;
  --color-miyamoto-red-50: #ffddcd;
  --color-miyamoto-red-100: #ffcbb9;
  --color-miyamoto-red-200: #ffad97;
  --color-miyamoto-red-300: #ff846b;
  --color-miyamoto-red-400: #ff5746;
  --color-miyamoto-red-500: #fa0c05;
  --color-miyamoto-red-600: #d3150d;
  --color-miyamoto-red-700: #aa130b;
  --color-miyamoto-red-800: #7f090d;
  --color-miyamoto-red-900: #5a0708;
  --color-miyamoto-red-950: #3c0000;
}

SCSS

$miyamoto-red: #e51e14;
$miyamoto-red-rgb: 229, 30, 20;
$miyamoto-red-light: mix(#fff, $miyamoto-red, 20%);
$miyamoto-red-dark: mix(#000, $miyamoto-red, 20%);

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