#DF2742

CSS

:root {
  --crossing-the-line: #df2742;
  --crossing-the-line-rgb: 223 39 66;
  --crossing-the-line-oklch: oklch(0.586 0.215 20.3);
}

.element {
  color: var(--crossing-the-line);
  background-color: hsl(351 74% 51%);
  border-color: oklch(0.586 0.215 20.3);
}

Tailwind CSS v4

@theme {
  --color-crossing-the-line: #df2742;
  --color-crossing-the-line-50: #ffddd9;
  --color-crossing-the-line-100: #ffccc7;
  --color-crossing-the-line-200: #ffaeaa;
  --color-crossing-the-line-300: #ff8584;
  --color-crossing-the-line-400: #ff5b67;
  --color-crossing-the-line-500: #f41f45;
  --color-crossing-the-line-600: #ce203b;
  --color-crossing-the-line-700: #a61a2f;
  --color-crossing-the-line-800: #7c1024;
  --color-crossing-the-line-900: #580b18;
  --color-crossing-the-line-950: #3b0009;
}

SCSS

$crossing-the-line: #df2742;
$crossing-the-line-rgb: 223, 39, 66;
$crossing-the-line-light: mix(#fff, $crossing-the-line, 20%);
$crossing-the-line-dark: mix(#000, $crossing-the-line, 20%);

.element {
  color: $crossing-the-line;
  box-shadow: 0 0 0 2px rgba($crossing-the-line, 0.35);
}