#A33925

CSS

:root {
  --brick: #a33925;
  --brick-rgb: 163 57 37;
  --brick-oklch: oklch(0.493 0.144 32.8);
}

.element {
  color: var(--brick);
  background-color: hsl(10 63% 39%);
  border-color: oklch(0.493 0.144 32.8);
}

Tailwind CSS v4

@theme {
  --color-brick: #a33925;
  --color-brick-50: #ffe7da;
  --color-brick-100: #ffd7c8;
  --color-brick-200: #ffbeab;
  --color-brick-300: #f89c85;
  --color-brick-400: #e77c66;
  --color-brick-500: #d45b43;
  --color-brick-600: #b34e3a;
  --color-brick-700: #903e2e;
  --color-brick-800: #6c2c22;
  --color-brick-900: #4c1d16;
  --color-brick-950: #320d08;
}

SCSS

$brick: #a33925;
$brick-rgb: 163, 57, 37;
$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);
}