Greenish Black

CSS

:root {
  --greenish-black: #454445;
  --greenish-black-rgb: 69 68 69;
  --greenish-black-oklch: oklch(0.388 0.002 325.6);
}

.element {
  color: var(--greenish-black);
  background-color: hsl(300 1% 27%);
  border-color: oklch(0.388 0.002 325.6);
}

Tailwind CSS v4

@theme {
  --color-greenish-black: #454445;
  --color-greenish-black-50: #f5f5f5;
  --color-greenish-black-100: #e8e7e8;
  --color-greenish-black-200: #d5d4d5;
  --color-greenish-black-300: #b8b7b8;
  --color-greenish-black-400: #9f9e9f;
  --color-greenish-black-500: #878687;
  --color-greenish-black-600: #727172;
  --color-greenish-black-700: #5b5a5b;
  --color-greenish-black-800: #434243;
  --color-greenish-black-900: #2e2e2e;
  --color-greenish-black-950: #1b1a1b;
}

SCSS

$greenish-black: #454445;
$greenish-black-rgb: 69, 68, 69;
$greenish-black-light: mix(#fff, $greenish-black, 20%);
$greenish-black-dark: mix(#000, $greenish-black, 20%);

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