#1E5F00

CSS

:root {
  --lincoln-green: #1e5f00;
  --lincoln-green-rgb: 30 95 0;
  --lincoln-green-oklch: oklch(0.427 0.135 139.1);
}

.element {
  color: var(--lincoln-green);
  background-color: hsl(101 100% 19%);
  border-color: oklch(0.427 0.135 139.1);
}

Tailwind CSS v4

@theme {
  --color-lincoln-green: #1e5f00;
  --color-lincoln-green-50: #e1ffdb;
  --color-lincoln-green-100: #d0f4ca;
  --color-lincoln-green-200: #b5e3ad;
  --color-lincoln-green-300: #91c987;
  --color-lincoln-green-400: #73b162;
  --color-lincoln-green-500: #529b3d;
  --color-lincoln-green-600: #468335;
  --color-lincoln-green-700: #38692a;
  --color-lincoln-green-800: #2a4d1a;
  --color-lincoln-green-900: #1c3511;
  --color-lincoln-green-950: #0c2004;
}

SCSS

$lincoln-green: #1e5f00;
$lincoln-green-rgb: 30, 95, 0;
$lincoln-green-light: mix(#fff, $lincoln-green, 20%);
$lincoln-green-dark: mix(#000, $lincoln-green, 20%);

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