#2F392E

CSS

:root {
  --terminal-black: #2f392e;
  --terminal-black-rgb: 47 57 46;
  --terminal-black-oklch: oklch(0.332 0.023 142.6);
}

.element {
  color: var(--terminal-black);
  background-color: hsl(115 11% 20%);
  border-color: oklch(0.332 0.023 142.6);
}

Tailwind CSS v4

@theme {
  --color-terminal-black: #2f392e;
  --color-terminal-black-50: #f1f7f1;
  --color-terminal-black-100: #e3eae3;
  --color-terminal-black-200: #ced7ce;
  --color-terminal-black-300: #b0bbb0;
  --color-terminal-black-400: #97a296;
  --color-terminal-black-500: #7e8a7c;
  --color-terminal-black-600: #6a7569;
  --color-terminal-black-700: #555e54;
  --color-terminal-black-800: #3e443d;
  --color-terminal-black-900: #2b2f2a;
  --color-terminal-black-950: #181c17;
}

SCSS

$terminal-black: #2f392e;
$terminal-black-rgb: 47, 57, 46;
$terminal-black-light: mix(#fff, $terminal-black, 20%);
$terminal-black-dark: mix(#000, $terminal-black, 20%);

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