That’s Atomic

CSS

:root {
  --that-s-atomic: #b0b08e;
  --that-s-atomic-rgb: 176 176 142;
  --that-s-atomic-oklch: oklch(0.748 0.047 107.5);
}

.element {
  color: var(--that-s-atomic);
  background-color: hsl(60 18% 62%);
  border-color: oklch(0.748 0.047 107.5);
}

Tailwind CSS v4

@theme {
  --color-that-s-atomic: #b0b08e;
  --color-that-s-atomic-50: #f6f7e7;
  --color-that-s-atomic-100: #e8e9d8;
  --color-that-s-atomic-200: #d5d6c0;
  --color-that-s-atomic-300: #b9ba9f;
  --color-that-s-atomic-400: #a1a181;
  --color-that-s-atomic-500: #898965;
  --color-that-s-atomic-600: #747455;
  --color-that-s-atomic-700: #5d5d44;
  --color-that-s-atomic-800: #444431;
  --color-that-s-atomic-900: #2f2f21;
  --color-that-s-atomic-950: #1c1b10;
}

SCSS

$that-s-atomic: #b0b08e;
$that-s-atomic-rgb: 176, 176, 142;
$that-s-atomic-light: mix(#fff, $that-s-atomic, 20%);
$that-s-atomic-dark: mix(#000, $that-s-atomic, 20%);

.element {
  color: $that-s-atomic;
  box-shadow: 0 0 0 2px rgba($that-s-atomic, 0.35);
}