#D53E07

CSS

:root {
  --flame-of-prometheus: #d53e07;
  --flame-of-prometheus-rgb: 213 62 7;
  --flame-of-prometheus-oklch: oklch(0.582 0.195 36.2);
}

.element {
  color: var(--flame-of-prometheus);
  background-color: hsl(16 94% 43%);
  border-color: oklch(0.582 0.195 36.2);
}

Tailwind CSS v4

@theme {
  --color-flame-of-prometheus: #d53e07;
  --color-flame-of-prometheus-50: #ffe3cd;
  --color-flame-of-prometheus-100: #ffd2b9;
  --color-flame-of-prometheus-200: #ffb696;
  --color-flame-of-prometheus-300: #ff906a;
  --color-flame-of-prometheus-400: #fb6b43;
  --color-flame-of-prometheus-500: #ea4000;
  --color-flame-of-prometheus-600: #c63804;
  --color-flame-of-prometheus-700: #9f2d06;
  --color-flame-of-prometheus-800: #771e08;
  --color-flame-of-prometheus-900: #541406;
  --color-flame-of-prometheus-950: #380400;
}

SCSS

$flame-of-prometheus: #d53e07;
$flame-of-prometheus-rgb: 213, 62, 7;
$flame-of-prometheus-light: mix(#fff, $flame-of-prometheus, 20%);
$flame-of-prometheus-dark: mix(#000, $flame-of-prometheus, 20%);

.element {
  color: $flame-of-prometheus;
  box-shadow: 0 0 0 2px rgba($flame-of-prometheus, 0.35);
}