#677B56

CSS

:root {
  --emerald-city: #677b56;
  --emerald-city-rgb: 103 123 86;
  --emerald-city-oklch: oklch(0.557 0.06 131.2);
}

.element {
  color: var(--emerald-city);
  background-color: hsl(92 18% 41%);
  border-color: oklch(0.557 0.06 131.2);
}

Tailwind CSS v4

@theme {
  --color-emerald-city: #677b56;
  --color-emerald-city-50: #eef9e8;
  --color-emerald-city-100: #e0edd8;
  --color-emerald-city-200: #cadac0;
  --color-emerald-city-300: #acbe9f;
  --color-emerald-city-400: #92a681;
  --color-emerald-city-500: #788f65;
  --color-emerald-city-600: #667956;
  --color-emerald-city-700: #516144;
  --color-emerald-city-800: #3c4730;
  --color-emerald-city-900: #293121;
  --color-emerald-city-950: #171d10;
}

SCSS

$emerald-city: #677b56;
$emerald-city-rgb: 103, 123, 86;
$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);
}