#959D91

CSS

:root {
  --concrete-jungle: #959d91;
  --concrete-jungle-rgb: 149 157 145;
  --concrete-jungle-oklch: oklch(0.686 0.02 135);
}

.element {
  color: var(--concrete-jungle);
  background-color: hsl(100 6% 59%);
  border-color: oklch(0.686 0.02 135);
}

Tailwind CSS v4

@theme {
  --color-concrete-jungle: #959d91;
  --color-concrete-jungle-50: #f2f6f1;
  --color-concrete-jungle-100: #e5e9e3;
  --color-concrete-jungle-200: #d0d6ce;
  --color-concrete-jungle-300: #b3bab0;
  --color-concrete-jungle-400: #9aa196;
  --color-concrete-jungle-500: #81897c;
  --color-concrete-jungle-600: #6d7469;
  --color-concrete-jungle-700: #575d54;
  --color-concrete-jungle-800: #40443d;
  --color-concrete-jungle-900: #2c2f2a;
  --color-concrete-jungle-950: #191b18;
}

SCSS

$concrete-jungle: #959d91;
$concrete-jungle-rgb: 149, 157, 145;
$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);
}