#999C8C

CSS

:root {
  --concrete-jungle: #999c8c;
  --concrete-jungle-rgb: 153 156 140;
  --concrete-jungle-oklch: oklch(0.686 0.023 115.6);
}

.element {
  color: var(--concrete-jungle);
  background-color: hsl(71 7% 58%);
  border-color: oklch(0.686 0.023 115.6);
}

Tailwind CSS v4

@theme {
  --color-concrete-jungle: #999c8c;
  --color-concrete-jungle-50: #f4f6ef;
  --color-concrete-jungle-100: #e7e9e0;
  --color-concrete-jungle-200: #d3d6cb;
  --color-concrete-jungle-300: #b6b9ac;
  --color-concrete-jungle-400: #9da091;
  --color-concrete-jungle-500: #858877;
  --color-concrete-jungle-600: #717365;
  --color-concrete-jungle-700: #5a5c51;
  --color-concrete-jungle-800: #42433a;
  --color-concrete-jungle-900: #2e2f28;
  --color-concrete-jungle-950: #1a1b16;
}

SCSS

$concrete-jungle: #999c8c;
$concrete-jungle-rgb: 153, 156, 140;
$concrete-jungle-light: mix(#fff, $concrete-jungle, 20%);
$concrete-jungle-dark: mix(#000, $concrete-jungle, 20%);

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