#684E35

CSS

:root {
  --black-power: #684e35;
  --black-power-rgb: 104 78 53;
  --black-power-oklch: oklch(0.445 0.052 64.7);
}

.element {
  color: var(--black-power);
  background-color: hsl(29 32% 31%);
  border-color: oklch(0.445 0.052 64.7);
}

Tailwind CSS v4

@theme {
  --color-black-power: #684e35;
  --color-black-power-50: #fff3e6;
  --color-black-power-100: #f4e5d6;
  --color-black-power-200: #e4d1be;
  --color-black-power-300: #cab39c;
  --color-black-power-400: #b4997f;
  --color-black-power-500: #9f7f62;
  --color-black-power-600: #866c53;
  --color-black-power-700: #6b5642;
  --color-black-power-800: #4f3f30;
  --color-black-power-900: #372b20;
  --color-black-power-950: #221810;
}

SCSS

$black-power: #684e35;
$black-power-rgb: 104, 78, 53;
$black-power-light: mix(#fff, $black-power, 20%);
$black-power-dark: mix(#000, $black-power, 20%);

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