#E12049

CSS

:root {
  --crossing-the-line: #e12049;
  --crossing-the-line-rgb: 225 32 73;
  --crossing-the-line-oklch: oklch(0.587 0.221 17.5);
}

.element {
  color: var(--crossing-the-line);
  background-color: hsl(347 76% 50%);
  border-color: oklch(0.587 0.221 17.5);
}

Tailwind CSS v4

@theme {
  --color-crossing-the-line: #e12049;
  --color-crossing-the-line-50: #ffdcdc;
  --color-crossing-the-line-100: #ffcaca;
  --color-crossing-the-line-200: #ffacae;
  --color-crossing-the-line-300: #ff8389;
  --color-crossing-the-line-400: #ff576d;
  --color-crossing-the-line-500: #f5134c;
  --color-crossing-the-line-600: #cf1841;
  --color-crossing-the-line-700: #a71534;
  --color-crossing-the-line-800: #7d0c28;
  --color-crossing-the-line-900: #58081b;
  --color-crossing-the-line-950: #3b000b;
}

SCSS

$crossing-the-line: #e12049;
$crossing-the-line-rgb: 225, 32, 73;
$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);
}