Smoking Night Blue

CSS

:root {
  --smoking-night-blue: #43454c;
  --smoking-night-blue-rgb: 67 69 76;
  --smoking-night-blue-oklch: oklch(0.391 0.012 273.1);
}

.element {
  color: var(--smoking-night-blue);
  background-color: hsl(227 6% 28%);
  border-color: oklch(0.391 0.012 273.1);
}

Tailwind CSS v4

@theme {
  --color-smoking-night-blue: #43454c;
  --color-smoking-night-blue-50: #f4f5f9;
  --color-smoking-night-blue-100: #e6e8ec;
  --color-smoking-night-blue-200: #d2d4d9;
  --color-smoking-night-blue-300: #b5b7be;
  --color-smoking-night-blue-400: #9c9ea6;
  --color-smoking-night-blue-500: #83868e;
  --color-smoking-night-blue-600: #6f7178;
  --color-smoking-night-blue-700: #595b60;
  --color-smoking-night-blue-800: #414247;
  --color-smoking-night-blue-900: #2d2e31;
  --color-smoking-night-blue-950: #1a1a1d;
}

SCSS

$smoking-night-blue: #43454c;
$smoking-night-blue-rgb: 67, 69, 76;
$smoking-night-blue-light: mix(#fff, $smoking-night-blue, 20%);
$smoking-night-blue-dark: mix(#000, $smoking-night-blue, 20%);

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