#D8111F

CSS

:root {
  --piercing-red: #d8111f;
  --piercing-red-rgb: 216 17 31;
  --piercing-red-oklch: oklch(0.56 0.222 26.6);
}

.element {
  color: var(--piercing-red);
  background-color: hsl(356 85% 46%);
  border-color: oklch(0.56 0.222 26.6);
}

Tailwind CSS v4

@theme {
  --color-piercing-red: #d8111f;
  --color-piercing-red-50: #ffded1;
  --color-piercing-red-100: #ffccbe;
  --color-piercing-red-200: #ffae9e;
  --color-piercing-red-300: #ff8574;
  --color-piercing-red-400: #ff5a52;
  --color-piercing-red-500: #f71926;
  --color-piercing-red-600: #d01c23;
  --color-piercing-red-700: #a8181c;
  --color-piercing-red-800: #7e0d16;
  --color-piercing-red-900: #59090e;
  --color-piercing-red-950: #3c0003;
}

SCSS

$piercing-red: #d8111f;
$piercing-red-rgb: 216, 17, 31;
$piercing-red-light: mix(#fff, $piercing-red, 20%);
$piercing-red-dark: mix(#000, $piercing-red, 20%);

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