#4B7047

CSS

:root {
  --under-the-radar: #4b7047;
  --under-the-radar-rgb: 75 112 71;
  --under-the-radar-oklch: oklch(0.506 0.076 142.1);
}

.element {
  color: var(--under-the-radar);
  background-color: hsl(114 22% 36%);
  border-color: oklch(0.506 0.076 142.1);
}

Tailwind CSS v4

@theme {
  --color-under-the-radar: #4b7047;
  --color-under-the-radar-50: #e9fbe8;
  --color-under-the-radar-100: #d9efd8;
  --color-under-the-radar-200: #c1ddc0;
  --color-under-the-radar-300: #a0c29f;
  --color-under-the-radar-400: #85aa81;
  --color-under-the-radar-500: #699364;
  --color-under-the-radar-600: #597c55;
  --color-under-the-radar-700: #476444;
  --color-under-the-radar-800: #344930;
  --color-under-the-radar-900: #233320;
  --color-under-the-radar-950: #121e10;
}

SCSS

$under-the-radar: #4b7047;
$under-the-radar-rgb: 75, 112, 71;
$under-the-radar-light: mix(#fff, $under-the-radar, 20%);
$under-the-radar-dark: mix(#000, $under-the-radar, 20%);

.element {
  color: $under-the-radar;
  box-shadow: 0 0 0 2px rgba($under-the-radar, 0.35);
}