#5E3842

CSS

:root {
  --red-rumour: #5e3842;
  --red-rumour-rgb: 94 56 66;
  --red-rumour-oklch: oklch(0.39 0.056 2.9);
}

.element {
  color: var(--red-rumour);
  background-color: hsl(344 25% 29%);
  border-color: oklch(0.39 0.056 2.9);
}

Tailwind CSS v4

@theme {
  --color-red-rumour: #5e3842;
  --color-red-rumour-50: #ffeff3;
  --color-red-rumour-100: #f9e1e5;
  --color-red-rumour-200: #eacbd1;
  --color-red-rumour-300: #d1acb3;
  --color-red-rumour-400: #bc919b;
  --color-red-rumour-500: #a67782;
  --color-red-rumour-600: #8d656e;
  --color-red-rumour-700: #715058;
  --color-red-rumour-800: #533a41;
  --color-red-rumour-900: #3a282d;
  --color-red-rumour-950: #24161a;
}

SCSS

$red-rumour: #5e3842;
$red-rumour-rgb: 94, 56, 66;
$red-rumour-light: mix(#fff, $red-rumour, 20%);
$red-rumour-dark: mix(#000, $red-rumour, 20%);

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