#6C7C59

CSS

:root {
  --emerald-city: #6c7c59;
  --emerald-city-rgb: 108 124 89;
  --emerald-city-oklch: oklch(0.563 0.055 128);
}

.element {
  color: var(--emerald-city);
  background-color: hsl(87 16% 42%);
  border-color: oklch(0.563 0.055 128);
}

Tailwind CSS v4

@theme {
  --color-emerald-city: #6c7c59;
  --color-emerald-city-50: #f0f9e8;
  --color-emerald-city-100: #e2ecd9;
  --color-emerald-city-200: #ccd9c1;
  --color-emerald-city-300: #aebea0;
  --color-emerald-city-400: #95a582;
  --color-emerald-city-500: #7b8e66;
  --color-emerald-city-600: #697857;
  --color-emerald-city-700: #546045;
  --color-emerald-city-800: #3d4631;
  --color-emerald-city-900: #2a3021;
  --color-emerald-city-950: #181d11;
}

SCSS

$emerald-city: #6c7c59;
$emerald-city-rgb: 108, 124, 89;
$emerald-city-light: mix(#fff, $emerald-city, 20%);
$emerald-city-dark: mix(#000, $emerald-city, 20%);

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