Heavy Red

CSS

:root {
  --heavy-red: #9e1212;
  --heavy-red-rgb: 158 18 18;
  --heavy-red-oklch: oklch(0.447 0.172 27.9);
}

.element {
  color: var(--heavy-red);
  background-color: hsl(0 80% 35%);
  border-color: oklch(0.447 0.172 27.9);
}

Tailwind CSS v4

@theme {
  --color-heavy-red: #9e1212;
  --color-heavy-red-50: #ffe4d8;
  --color-heavy-red-100: #ffd3c6;
  --color-heavy-red-200: #ffb8a9;
  --color-heavy-red-300: #ff9482;
  --color-heavy-red-400: #f37063;
  --color-heavy-red-500: #e14a40;
  --color-heavy-red-600: #be4037;
  --color-heavy-red-700: #99332b;
  --color-heavy-red-800: #722321;
  --color-heavy-red-900: #511815;
  --color-heavy-red-950: #350707;
}

SCSS

$heavy-red: #9e1212;
$heavy-red-rgb: 158, 18, 18;
$heavy-red-light: mix(#fff, $heavy-red, 20%);
$heavy-red-dark: mix(#000, $heavy-red, 20%);

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