#20202E

CSS

:root {
  --black-velvet: #20202e;
  --black-velvet-rgb: 32 32 46;
  --black-velvet-oklch: oklch(0.25 0.026 284.3);
}

.element {
  color: var(--black-velvet);
  background-color: hsl(240 18% 15%);
  border-color: oklch(0.25 0.026 284.3);
}

Tailwind CSS v4

@theme {
  --color-black-velvet: #20202e;
  --color-black-velvet-50: #f4f4fd;
  --color-black-velvet-100: #e7e7f1;
  --color-black-velvet-200: #d3d3df;
  --color-black-velvet-300: #b6b6c5;
  --color-black-velvet-400: #9c9dae;
  --color-black-velvet-500: #848498;
  --color-black-velvet-600: #6f7080;
  --color-black-velvet-700: #595967;
  --color-black-velvet-800: #41414c;
  --color-black-velvet-900: #2d2d34;
  --color-black-velvet-950: #1a1a20;
}

SCSS

$black-velvet: #20202e;
$black-velvet-rgb: 32, 32, 46;
$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);
}