#E31C41

CSS

:root {
  --crossing-the-line: #e31c41;
  --crossing-the-line-rgb: 227 28 65;
  --crossing-the-line-oklch: oklch(0.588 0.224 19.8);
}

.element {
  color: var(--crossing-the-line);
  background-color: hsl(349 78% 50%);
  border-color: oklch(0.588 0.224 19.8);
}

Tailwind CSS v4

@theme {
  --color-crossing-the-line: #e31c41;
  --color-crossing-the-line-50: #ffdcd9;
  --color-crossing-the-line-100: #ffcac6;
  --color-crossing-the-line-200: #ffaca9;
  --color-crossing-the-line-300: #ff8283;
  --color-crossing-the-line-400: #ff5665;
  --color-crossing-the-line-500: #f70843;
  --color-crossing-the-line-600: #d1133a;
  --color-crossing-the-line-700: #a8122e;
  --color-crossing-the-line-800: #7e0923;
  --color-crossing-the-line-900: #590717;
  --color-crossing-the-line-950: #3c0008;
}

SCSS

$crossing-the-line: #e31c41;
$crossing-the-line-rgb: 227, 28, 65;
$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);
}