Halogen Blue

CSS

:root {
  --halogen-blue: #b0bad5;
  --halogen-blue-rgb: 176 186 213;
  --halogen-blue-oklch: oklch(0.79 0.04 269.4);
}

.element {
  color: var(--halogen-blue);
  background-color: hsl(224 31% 76%);
  border-color: oklch(0.79 0.04 269.4);
}

Tailwind CSS v4

@theme {
  --color-halogen-blue: #b0bad5;
  --color-halogen-blue-50: #f1f5ff;
  --color-halogen-blue-100: #e3e7f6;
  --color-halogen-blue-200: #ced4e6;
  --color-halogen-blue-300: #b0b7cd;
  --color-halogen-blue-400: #959eb7;
  --color-halogen-blue-500: #7b85a1;
  --color-halogen-blue-600: #687188;
  --color-halogen-blue-700: #535a6d;
  --color-halogen-blue-800: #3c4251;
  --color-halogen-blue-900: #292e38;
  --color-halogen-blue-950: #171a23;
}

SCSS

$halogen-blue: #b0bad5;
$halogen-blue-rgb: 176, 186, 213;
$halogen-blue-light: mix(#fff, $halogen-blue, 20%);
$halogen-blue-dark: mix(#000, $halogen-blue, 20%);

.element {
  color: $halogen-blue;
  box-shadow: 0 0 0 2px rgba($halogen-blue, 0.35);
}