#E02541

CSS

:root {
  --crossing-the-line: #e02541;
  --crossing-the-line-rgb: 224 37 65;
  --crossing-the-line-oklch: oklch(0.587 0.217 20.5);
}

.element {
  color: var(--crossing-the-line);
  background-color: hsl(351 75% 51%);
  border-color: oklch(0.587 0.217 20.5);
}

Tailwind CSS v4

@theme {
  --color-crossing-the-line: #e02541;
  --color-crossing-the-line-50: #ffddd9;
  --color-crossing-the-line-100: #ffcbc7;
  --color-crossing-the-line-200: #ffada9;
  --color-crossing-the-line-300: #ff8483;
  --color-crossing-the-line-400: #ff5a66;
  --color-crossing-the-line-500: #f41c43;
  --color-crossing-the-line-600: #ce1e3a;
  --color-crossing-the-line-700: #a6192e;
  --color-crossing-the-line-800: #7c0f23;
  --color-crossing-the-line-900: #580a17;
  --color-crossing-the-line-950: #3b0008;
}

SCSS

$crossing-the-line: #e02541;
$crossing-the-line-rgb: 224, 37, 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);
}