#271F2C

CSS

:root {
  --black-velvet: #271f2c;
  --black-velvet-rgb: 39 31 44;
  --black-velvet-oklch: oklch(0.254 0.027 312.2);
}

.element {
  color: var(--black-velvet);
  background-color: hsl(277 17% 15%);
  border-color: oklch(0.254 0.027 312.2);
}

Tailwind CSS v4

@theme {
  --color-black-velvet: #271f2c;
  --color-black-velvet-50: #f8f3fb;
  --color-black-velvet-100: #ebe5ee;
  --color-black-velvet-200: #d8d1dc;
  --color-black-velvet-300: #bcb4c1;
  --color-black-velvet-400: #a49aaa;
  --color-black-velvet-500: #8c8193;
  --color-black-velvet-600: #776e7c;
  --color-black-velvet-700: #5f5864;
  --color-black-velvet-800: #454049;
  --color-black-velvet-900: #302c33;
  --color-black-velvet-950: #1c191f;
}

SCSS

$black-velvet: #271f2c;
$black-velvet-rgb: 39, 31, 44;
$black-velvet-light: mix(#fff, $black-velvet, 20%);
$black-velvet-dark: mix(#000, $black-velvet, 20%);

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