#E21D48

CSS

:root {
  --crossing-the-line: #e21d48;
  --crossing-the-line-rgb: 226 29 72;
  --crossing-the-line-oklch: oklch(0.588 0.223 17.7);
}

.element {
  color: var(--crossing-the-line);
  background-color: hsl(347 77% 50%);
  border-color: oklch(0.588 0.223 17.7);
}

Tailwind CSS v4

@theme {
  --color-crossing-the-line: #e21d48;
  --color-crossing-the-line-50: #ffdcdb;
  --color-crossing-the-line-100: #ffcac9;
  --color-crossing-the-line-200: #ffacad;
  --color-crossing-the-line-300: #ff8288;
  --color-crossing-the-line-400: #ff566c;
  --color-crossing-the-line-500: #f60b4b;
  --color-crossing-the-line-600: #d01540;
  --color-crossing-the-line-700: #a81233;
  --color-crossing-the-line-800: #7d0a27;
  --color-crossing-the-line-900: #59071a;
  --color-crossing-the-line-950: #3b000b;
}

SCSS

$crossing-the-line: #e21d48;
$crossing-the-line-rgb: 226, 29, 72;
$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);
}