#DD6F55

CSS

:root {
  --phoenix-red: #dd6f55;
  --phoenix-red-rgb: 221 111 85;
  --phoenix-red-oklch: oklch(0.665 0.143 34.5);
}

.element {
  color: var(--phoenix-red);
  background-color: hsl(11 67% 60%);
  border-color: oklch(0.665 0.143 34.5);
}

Tailwind CSS v4

@theme {
  --color-phoenix-red: #dd6f55;
  --color-phoenix-red-50: #ffe8d9;
  --color-phoenix-red-100: #ffd8c7;
  --color-phoenix-red-200: #ffbfa9;
  --color-phoenix-red-300: #f79c83;
  --color-phoenix-red-400: #e67c63;
  --color-phoenix-red-500: #d45c40;
  --color-phoenix-red-600: #b34e37;
  --color-phoenix-red-700: #903e2c;
  --color-phoenix-red-800: #6b2c20;
  --color-phoenix-red-900: #4c1e15;
  --color-phoenix-red-950: #310d07;
}

SCSS

$phoenix-red: #dd6f55;
$phoenix-red-rgb: 221, 111, 85;
$phoenix-red-light: mix(#fff, $phoenix-red, 20%);
$phoenix-red-dark: mix(#000, $phoenix-red, 20%);

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