#5D7D59

CSS

:root {
  --emerald-city: #5d7d59;
  --emerald-city-rgb: 93 125 89;
  --emerald-city-oklch: oklch(0.555 0.066 141.9);
}

.element {
  color: var(--emerald-city);
  background-color: hsl(113 17% 42%);
  border-color: oklch(0.555 0.066 141.9);
}

Tailwind CSS v4

@theme {
  --color-emerald-city: #5d7d59;
  --color-emerald-city-50: #eafaea;
  --color-emerald-city-100: #dbeeda;
  --color-emerald-city-200: #c4dcc3;
  --color-emerald-city-300: #a4c1a2;
  --color-emerald-city-400: #89a985;
  --color-emerald-city-500: #6d9269;
  --color-emerald-city-600: #5d7b59;
  --color-emerald-city-700: #4a6347;
  --color-emerald-city-800: #364832;
  --color-emerald-city-900: #253222;
  --color-emerald-city-950: #141e11;
}

SCSS

$emerald-city: #5d7d59;
$emerald-city-rgb: 93, 125, 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);
}