#627B64

CSS

:root {
  --emerald-city: #627b64;
  --emerald-city-rgb: 98 123 100;
  --emerald-city-oklch: oklch(0.556 0.046 147.1);
}

.element {
  color: var(--emerald-city);
  background-color: hsl(125 11% 43%);
  border-color: oklch(0.556 0.046 147.1);
}

Tailwind CSS v4

@theme {
  --color-emerald-city: #627b64;
  --color-emerald-city-50: #edf9ee;
  --color-emerald-city-100: #deece0;
  --color-emerald-city-200: #c7daca;
  --color-emerald-city-300: #a8beab;
  --color-emerald-city-400: #8da68f;
  --color-emerald-city-500: #738f75;
  --color-emerald-city-600: #617963;
  --color-emerald-city-700: #4e614f;
  --color-emerald-city-800: #394739;
  --color-emerald-city-900: #273127;
  --color-emerald-city-950: #151d15;
}

SCSS

$emerald-city: #627b64;
$emerald-city-rgb: 98, 123, 100;
$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);
}