#8D1900

CSS

:root {
  --brick-red: #8d1900;
  --brick-red-rgb: 141 25 0;
  --brick-red-oklch: oklch(0.417 0.154 33);
}

.element {
  color: var(--brick-red);
  background-color: hsl(11 100% 28%);
  border-color: oklch(0.417 0.154 33);
}

Tailwind CSS v4

@theme {
  --color-brick-red: #8d1900;
  --color-brick-red-50: #ffe6d8;
  --color-brick-red-100: #ffd6c6;
  --color-brick-red-200: #ffbda8;
  --color-brick-red-300: #fb9a81;
  --color-brick-red-400: #eb7861;
  --color-brick-red-500: #d9563d;
  --color-brick-red-600: #b74a34;
  --color-brick-red-700: #933b2a;
  --color-brick-red-800: #6e291f;
  --color-brick-red-900: #4d1c14;
  --color-brick-red-950: #330b06;
}

SCSS

$brick-red: #8d1900;
$brick-red-rgb: 141, 25, 0;
$brick-red-light: mix(#fff, $brick-red, 20%);
$brick-red-dark: mix(#000, $brick-red, 20%);

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