#999C92

CSS

:root {
  --concrete-jungle: #999c92;
  --concrete-jungle-rgb: 153 156 146;
  --concrete-jungle-oklch: oklch(0.687 0.015 120.4);
}

.element {
  color: var(--concrete-jungle);
  background-color: hsl(78 5% 59%);
  border-color: oklch(0.687 0.015 120.4);
}

Tailwind CSS v4

@theme {
  --color-concrete-jungle: #999c92;
  --color-concrete-jungle-50: #f4f6f1;
  --color-concrete-jungle-100: #e7e9e3;
  --color-concrete-jungle-200: #d3d5ce;
  --color-concrete-jungle-300: #b6b9b0;
  --color-concrete-jungle-400: #9da096;
  --color-concrete-jungle-500: #85887d;
  --color-concrete-jungle-600: #70736a;
  --color-concrete-jungle-700: #5a5c55;
  --color-concrete-jungle-800: #42433d;
  --color-concrete-jungle-900: #2d2e2a;
  --color-concrete-jungle-950: #1a1b18;
}

SCSS

$concrete-jungle: #999c92;
$concrete-jungle-rgb: 153, 156, 146;
$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);
}