Blue Charcoal

CSS

:root {
  --blue-charcoal: #262b2f;
  --blue-charcoal-rgb: 38 43 47;
  --blue-charcoal-oklch: oklch(0.286 0.01 242);
}

.element {
  color: var(--blue-charcoal);
  background-color: hsl(207 11% 17%);
  border-color: oklch(0.286 0.01 242);
}

Tailwind CSS v4

@theme {
  --color-blue-charcoal: #262b2f;
  --color-blue-charcoal-50: #f3f5f8;
  --color-blue-charcoal-100: #e5e8eb;
  --color-blue-charcoal-200: #d1d5d8;
  --color-blue-charcoal-300: #b3b8bc;
  --color-blue-charcoal-400: #999fa4;
  --color-blue-charcoal-500: #80878c;
  --color-blue-charcoal-600: #6d7277;
  --color-blue-charcoal-700: #575b5f;
  --color-blue-charcoal-800: #3f4346;
  --color-blue-charcoal-900: #2c2e30;
  --color-blue-charcoal-950: #191b1c;
}

SCSS

$blue-charcoal: #262b2f;
$blue-charcoal-rgb: 38, 43, 47;
$blue-charcoal-light: mix(#fff, $blue-charcoal, 20%);
$blue-charcoal-dark: mix(#000, $blue-charcoal, 20%);

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