#8E1000

CSS

:root {
  --brick-red: #8e1000;
  --brick-red-rgb: 142 16 0;
  --brick-red-oklch: oklch(0.413 0.16 31.2);
}

.element {
  color: var(--brick-red);
  background-color: hsl(7 100% 28%);
  border-color: oklch(0.413 0.16 31.2);
}

Tailwind CSS v4

@theme {
  --color-brick-red: #8e1000;
  --color-brick-red-50: #ffe5d8;
  --color-brick-red-100: #ffd5c6;
  --color-brick-red-200: #ffbba8;
  --color-brick-red-300: #fe9881;
  --color-brick-red-400: #ee7661;
  --color-brick-red-500: #dc523d;
  --color-brick-red-600: #ba4735;
  --color-brick-red-700: #95382a;
  --color-brick-red-800: #6f271f;
  --color-brick-red-900: #4f1a15;
  --color-brick-red-950: #340a06;
}

SCSS

$brick-red: #8e1000;
$brick-red-rgb: 142, 16, 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);
}