Dark Grey

CSS

:root {
  --dark-grey: #363737;
  --dark-grey-rgb: 54 55 55;
  --dark-grey-oklch: oklch(0.336 0.001 197.1);
}

.element {
  color: var(--dark-grey);
  background-color: hsl(180 1% 21%);
  border-color: oklch(0.336 0.001 197.1);
}

Tailwind CSS v4

@theme {
  --color-dark-grey: #363737;
  --color-dark-grey-50: #f5f5f5;
  --color-dark-grey-100: #e7e8e8;
  --color-dark-grey-200: #d3d4d4;
  --color-dark-grey-300: #b6b7b7;
  --color-dark-grey-400: #9d9f9f;
  --color-dark-grey-500: #858686;
  --color-dark-grey-600: #717272;
  --color-dark-grey-700: #5a5b5b;
  --color-dark-grey-800: #424242;
  --color-dark-grey-900: #2d2e2e;
  --color-dark-grey-950: #1a1b1b;
}

SCSS

$dark-grey: #363737;
$dark-grey-rgb: 54, 55, 55;
$dark-grey-light: mix(#fff, $dark-grey, 20%);
$dark-grey-dark: mix(#000, $dark-grey, 20%);

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