#D61921

CSS

:root {
  --piercing-red: #d61921;
  --piercing-red-rgb: 214 25 33;
  --piercing-red-oklch: oklch(0.559 0.217 26.8);
}

.element {
  color: var(--piercing-red);
  background-color: hsl(357 79% 47%);
  border-color: oklch(0.559 0.217 26.8);
}

Tailwind CSS v4

@theme {
  --color-piercing-red: #d61921;
  --color-piercing-red-50: #ffded2;
  --color-piercing-red-100: #ffcdbf;
  --color-piercing-red-200: #ffaf9e;
  --color-piercing-red-300: #ff8675;
  --color-piercing-red-400: #ff5c54;
  --color-piercing-red-500: #f52129;
  --color-piercing-red-600: #cf2225;
  --color-piercing-red-700: #a61c1d;
  --color-piercing-red-800: #7d1117;
  --color-piercing-red-900: #580b0f;
  --color-piercing-red-950: #3b0003;
}

SCSS

$piercing-red: #d61921;
$piercing-red-rgb: 214, 25, 33;
$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);
}