#B22E00

CSS

:root {
  --rusty-red: #b22e00;
  --rusty-red-rgb: 178 46 0;
  --rusty-red-oklch: oklch(0.505 0.175 35.6);
}

.element {
  color: var(--rusty-red);
  background-color: hsl(16 100% 35%);
  border-color: oklch(0.505 0.175 35.6);
}

Tailwind CSS v4

@theme {
  --color-rusty-red: #b22e00;
  --color-rusty-red-50: #ffe5d2;
  --color-rusty-red-100: #ffd4be;
  --color-rusty-red-200: #ffba9e;
  --color-rusty-red-300: #ff9574;
  --color-rusty-red-400: #f37251;
  --color-rusty-red-500: #e14d24;
  --color-rusty-red-600: #be4221;
  --color-rusty-red-700: #99351a;
  --color-rusty-red-800: #732414;
  --color-rusty-red-900: #51180d;
  --color-rusty-red-950: #360802;
}

SCSS

$rusty-red: #b22e00;
$rusty-red-rgb: 178, 46, 0;
$rusty-red-light: mix(#fff, $rusty-red, 20%);
$rusty-red-dark: mix(#000, $rusty-red, 20%);

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