#2C2434

CSS

:root {
  --black-velvet: #2c2434;
  --black-velvet-rgb: 44 36 52;
  --black-velvet-oklch: oklch(0.276 0.031 307.2);
}

.element {
  color: var(--black-velvet);
  background-color: hsl(270 18% 17%);
  border-color: oklch(0.276 0.031 307.2);
}

Tailwind CSS v4

@theme {
  --color-black-velvet: #2c2434;
  --color-black-velvet-50: #f8f3fc;
  --color-black-velvet-100: #ebe5f0;
  --color-black-velvet-200: #d8d1df;
  --color-black-velvet-300: #bcb3c4;
  --color-black-velvet-400: #a39aad;
  --color-black-velvet-500: #8c8197;
  --color-black-velvet-600: #766d7f;
  --color-black-velvet-700: #5e5766;
  --color-black-velvet-800: #45404b;
  --color-black-velvet-900: #302c34;
  --color-black-velvet-950: #1c1920;
}

SCSS

$black-velvet: #2c2434;
$black-velvet-rgb: 44, 36, 52;
$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);
}