#B31F21

CSS

:root {
  --brick-by-brick: #b31f21;
  --brick-by-brick-rgb: 179 31 33;
  --brick-by-brick-oklch: oklch(0.496 0.183 26.6);
}

.element {
  color: var(--brick-by-brick);
  background-color: hsl(359 70% 41%);
  border-color: oklch(0.496 0.183 26.6);
}

Tailwind CSS v4

@theme {
  --color-brick-by-brick: #b31f21;
  --color-brick-by-brick-50: #ffe2d8;
  --color-brick-by-brick-100: #ffd1c5;
  --color-brick-by-brick-200: #ffb6a8;
  --color-brick-by-brick-300: #ff9081;
  --color-brick-by-brick-400: #f86c62;
  --color-brick-by-brick-500: #e6433e;
  --color-brick-by-brick-600: #c23a36;
  --color-brick-by-brick-700: #9c2f2a;
  --color-brick-by-brick-800: #752020;
  --color-brick-by-brick-900: #531515;
  --color-brick-by-brick-950: #370507;
}

SCSS

$brick-by-brick: #b31f21;
$brick-by-brick-rgb: 179, 31, 33;
$brick-by-brick-light: mix(#fff, $brick-by-brick, 20%);
$brick-by-brick-dark: mix(#000, $brick-by-brick, 20%);

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