#E02442

CSS

:root {
  --crossing-the-line: #e02442;
  --crossing-the-line-rgb: 224 36 66;
  --crossing-the-line-oklch: oklch(0.587 0.218 20);
}

.element {
  color: var(--crossing-the-line);
  background-color: hsl(350 75% 51%);
  border-color: oklch(0.587 0.218 20);
}

Tailwind CSS v4

@theme {
  --color-crossing-the-line: #e02442;
  --color-crossing-the-line-50: #ffddd9;
  --color-crossing-the-line-100: #ffcbc7;
  --color-crossing-the-line-200: #ffadaa;
  --color-crossing-the-line-300: #ff8484;
  --color-crossing-the-line-400: #ff5a67;
  --color-crossing-the-line-500: #f51a45;
  --color-crossing-the-line-600: #cf1d3b;
  --color-crossing-the-line-700: #a6182f;
  --color-crossing-the-line-800: #7c0e24;
  --color-crossing-the-line-900: #580a18;
  --color-crossing-the-line-950: #3b0009;
}

SCSS

$crossing-the-line: #e02442;
$crossing-the-line-rgb: 224, 36, 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);
}