#63373E

CSS

:root {
  --red-rumour: #63373e;
  --red-rumour-rgb: 99 55 62;
  --red-rumour-oklch: oklch(0.394 0.063 10.2);
}

.element {
  color: var(--red-rumour);
  background-color: hsl(350 29% 30%);
  border-color: oklch(0.394 0.063 10.2);
}

Tailwind CSS v4

@theme {
  --color-red-rumour: #63373e;
  --color-red-rumour-50: #ffeef0;
  --color-red-rumour-100: #fce0e2;
  --color-red-rumour-200: #eecacd;
  --color-red-rumour-300: #d6abaf;
  --color-red-rumour-400: #c08f96;
  --color-red-rumour-500: #ab757c;
  --color-red-rumour-600: #916369;
  --color-red-rumour-700: #744f54;
  --color-red-rumour-800: #56393e;
  --color-red-rumour-900: #3c272b;
  --color-red-rumour-950: #251518;
}

SCSS

$red-rumour: #63373e;
$red-rumour-rgb: 99, 55, 62;
$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);
}