#697A5C

CSS

:root {
  --emerald-city: #697a5c;
  --emerald-city-rgb: 105 122 92;
  --emerald-city-oklch: oklch(0.557 0.049 131.9);
}

.element {
  color: var(--emerald-city);
  background-color: hsl(94 14% 42%);
  border-color: oklch(0.557 0.049 131.9);
}

Tailwind CSS v4

@theme {
  --color-emerald-city: #697a5c;
  --color-emerald-city-50: #eff8ea;
  --color-emerald-city-100: #e1ecdb;
  --color-emerald-city-200: #ccd9c4;
  --color-emerald-city-300: #adbda4;
  --color-emerald-city-400: #94a587;
  --color-emerald-city-500: #7a8d6c;
  --color-emerald-city-600: #68785b;
  --color-emerald-city-700: #536049;
  --color-emerald-city-800: #3d4634;
  --color-emerald-city-900: #2a3023;
  --color-emerald-city-950: #171d12;
}

SCSS

$emerald-city: #697a5c;
$emerald-city-rgb: 105, 122, 92;
$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);
}