#A43922

CSS

:root {
  --brick: #a43922;
  --brick-rgb: 164 57 34;
  --brick-oklch: oklch(0.495 0.146 33.8);
}

.element {
  color: var(--brick);
  background-color: hsl(11 66% 39%);
  border-color: oklch(0.495 0.146 33.8);
}

Tailwind CSS v4

@theme {
  --color-brick: #a43922;
  --color-brick-50: #ffe7d9;
  --color-brick-100: #ffd7c7;
  --color-brick-200: #ffbea9;
  --color-brick-300: #f89c83;
  --color-brick-400: #e77b63;
  --color-brick-500: #d55a40;
  --color-brick-600: #b44d37;
  --color-brick-700: #913e2c;
  --color-brick-800: #6c2b20;
  --color-brick-900: #4c1d15;
  --color-brick-950: #320d07;
}

SCSS

$brick: #a43922;
$brick-rgb: 164, 57, 34;
$brick-light: mix(#fff, $brick, 20%);
$brick-dark: mix(#000, $brick, 20%);

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