#9B9B90

CSS

:root {
  --concrete-jungle: #9b9b90;
  --concrete-jungle-rgb: 155 155 144;
  --concrete-jungle-oklch: oklch(0.686 0.016 106.8);
}

.element {
  color: var(--concrete-jungle);
  background-color: hsl(60 5% 59%);
  border-color: oklch(0.686 0.016 106.8);
}

Tailwind CSS v4

@theme {
  --color-concrete-jungle: #9b9b90;
  --color-concrete-jungle-50: #f5f5f0;
  --color-concrete-jungle-100: #e8e8e2;
  --color-concrete-jungle-200: #d4d5cd;
  --color-concrete-jungle-300: #b8b8af;
  --color-concrete-jungle-400: #9f9f95;
  --color-concrete-jungle-500: #87877b;
  --color-concrete-jungle-600: #727268;
  --color-concrete-jungle-700: #5b5b53;
  --color-concrete-jungle-800: #43433d;
  --color-concrete-jungle-900: #2e2e2a;
  --color-concrete-jungle-950: #1b1b17;
}

SCSS

$concrete-jungle: #9b9b90;
$concrete-jungle-rgb: 155, 155, 144;
$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);
}