#657227

CSS

:root {
  --muddy-green: #657227;
  --muddy-green-rgb: 101 114 39;
  --muddy-green-oklch: oklch(0.525 0.1 118.4);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(70 49% 30%);
  border-color: oklch(0.525 0.1 118.4);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #657227;
  --color-muddy-green-50: #f1fada;
  --color-muddy-green-100: #e3edc8;
  --color-muddy-green-200: #cedbab;
  --color-muddy-green-300: #b0c085;
  --color-muddy-green-400: #99a761;
  --color-muddy-green-500: #808f3c;
  --color-muddy-green-600: #6c7934;
  --color-muddy-green-700: #566129;
  --color-muddy-green-800: #40471b;
  --color-muddy-green-900: #2c3111;
  --color-muddy-green-950: #1a1d04;
}

SCSS

$muddy-green: #657227;
$muddy-green-rgb: 101, 114, 39;
$muddy-green-light: mix(#fff, $muddy-green, 20%);
$muddy-green-dark: mix(#000, $muddy-green, 20%);

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