#42282B

CSS

:root {
  --dark-roast: #42282b;
  --dark-roast-rgb: 66 40 43;
  --dark-roast-oklch: oklch(0.31 0.039 12.1);
}

.element {
  color: var(--dark-roast);
  background-color: hsl(353 25% 21%);
  border-color: oklch(0.31 0.039 12.1);
}

Tailwind CSS v4

@theme {
  --color-dark-roast: #42282b;
  --color-dark-roast-50: #fff1f2;
  --color-dark-roast-100: #f5e3e4;
  --color-dark-roast-200: #e5cecf;
  --color-dark-roast-300: #cbb0b1;
  --color-dark-roast-400: #b49598;
  --color-dark-roast-500: #9e7c7f;
  --color-dark-roast-600: #86696c;
  --color-dark-roast-700: #6b5456;
  --color-dark-roast-800: #4f3d3f;
  --color-dark-roast-900: #372a2b;
  --color-dark-roast-950: #221719;
}

SCSS

$dark-roast: #42282b;
$dark-roast-rgb: 66, 40, 43;
$dark-roast-light: mix(#fff, $dark-roast, 20%);
$dark-roast-dark: mix(#000, $dark-roast, 20%);

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