#253027

CSS

:root {
  --terminal-black: #253027;
  --terminal-black-rgb: 37 48 39;
  --terminal-black-oklch: oklch(0.296 0.022 150.2);
}

.element {
  color: var(--terminal-black);
  background-color: hsl(131 13% 17%);
  border-color: oklch(0.296 0.022 150.2);
}

Tailwind CSS v4

@theme {
  --color-terminal-black: #253027;
  --color-terminal-black-50: #f1f7f2;
  --color-terminal-black-100: #e3eae4;
  --color-terminal-black-200: #ced7d0;
  --color-terminal-black-300: #afbbb2;
  --color-terminal-black-400: #96a298;
  --color-terminal-black-500: #7c8b7f;
  --color-terminal-black-600: #69756b;
  --color-terminal-black-700: #545e56;
  --color-terminal-black-800: #3d453e;
  --color-terminal-black-900: #2a2f2b;
  --color-terminal-black-950: #181c18;
}

SCSS

$terminal-black: #253027;
$terminal-black-rgb: 37, 48, 39;
$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);
}