#FF3B40

CSS

:root {
  --red-coral: #ff3b40;
  --red-coral-rgb: 255 59 64;
  --red-coral-oklch: oklch(0.656 0.23 25.2);
}

.element {
  color: var(--red-coral);
  background-color: hsl(358 100% 62%);
  border-color: oklch(0.656 0.23 25.2);
}

Tailwind CSS v4

@theme {
  --color-red-coral: #ff3b40;
  --color-red-coral-50: #ffdcd1;
  --color-red-coral-100: #ffcabe;
  --color-red-coral-200: #ffac9e;
  --color-red-coral-300: #ff8174;
  --color-red-coral-400: #ff5453;
  --color-red-coral-500: #fa0028;
  --color-red-coral-600: #d30c24;
  --color-red-coral-700: #aa0d1c;
  --color-red-coral-800: #7f0517;
  --color-red-coral-900: #5a050f;
  --color-red-coral-950: #3d0003;
}

SCSS

$red-coral: #ff3b40;
$red-coral-rgb: 255, 59, 64;
$red-coral-light: mix(#fff, $red-coral, 20%);
$red-coral-dark: mix(#000, $red-coral, 20%);

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