#D8390A

CSS

:root {
  --flame-of-prometheus: #d8390a;
  --flame-of-prometheus-rgb: 216 57 10;
  --flame-of-prometheus-oklch: oklch(0.583 0.202 34.6);
}

.element {
  color: var(--flame-of-prometheus);
  background-color: hsl(14 91% 44%);
  border-color: oklch(0.583 0.202 34.6);
}

Tailwind CSS v4

@theme {
  --color-flame-of-prometheus: #d8390a;
  --color-flame-of-prometheus-50: #ffe2cd;
  --color-flame-of-prometheus-100: #ffd1b9;
  --color-flame-of-prometheus-200: #ffb596;
  --color-flame-of-prometheus-300: #ff8e6a;
  --color-flame-of-prometheus-400: #fe6744;
  --color-flame-of-prometheus-500: #ed3900;
  --color-flame-of-prometheus-600: #c83306;
  --color-flame-of-prometheus-700: #a12907;
  --color-flame-of-prometheus-800: #791b09;
  --color-flame-of-prometheus-900: #551206;
  --color-flame-of-prometheus-950: #390300;
}

SCSS

$flame-of-prometheus: #d8390a;
$flame-of-prometheus-rgb: 216, 57, 10;
$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);
}