#5D0500

CSS

:root {
  --spikey-red: #5d0500;
  --spikey-red-rgb: 93 5 0;
  --spikey-red-oklch: oklch(0.304 0.12 30.6);
}

.element {
  color: var(--spikey-red);
  background-color: hsl(3 100% 18%);
  border-color: oklch(0.304 0.12 30.6);
}

Tailwind CSS v4

@theme {
  --color-spikey-red: #5d0500;
  --color-spikey-red-50: #ffeae0;
  --color-spikey-red-100: #ffdacf;
  --color-spikey-red-200: #ffc2b4;
  --color-spikey-red-300: #eea190;
  --color-spikey-red-400: #dc8273;
  --color-spikey-red-500: #c96454;
  --color-spikey-red-600: #aa5548;
  --color-spikey-red-700: #884439;
  --color-spikey-red-800: #66302a;
  --color-spikey-red-900: #47211c;
  --color-spikey-red-950: #2e100c;
}

SCSS

$spikey-red: #5d0500;
$spikey-red-rgb: 93, 5, 0;
$spikey-red-light: mix(#fff, $spikey-red, 20%);
$spikey-red-dark: mix(#000, $spikey-red, 20%);

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