#130515

CSS

:root {
  --glossy-black: #130515;
  --glossy-black-rgb: 19 5 21;
  --glossy-black-oklch: oklch(0.15 0.041 322.8);
}

.element {
  color: var(--glossy-black);
  background-color: hsl(293 62% 5%);
  border-color: oklch(0.15 0.041 322.8);
}

Tailwind CSS v4

@theme {
  --color-glossy-black: #130515;
  --color-glossy-black-50: #fcf1fc;
  --color-glossy-black-100: #efe3f0;
  --color-glossy-black-200: #decfde;
  --color-glossy-black-300: #c3b1c3;
  --color-glossy-black-400: #ab97ad;
  --color-glossy-black-500: #947d96;
  --color-glossy-black-600: #7d6a7f;
  --color-glossy-black-700: #645566;
  --color-glossy-black-800: #493e4b;
  --color-glossy-black-900: #332b34;
  --color-glossy-black-950: #1e1820;
}

SCSS

$glossy-black: #130515;
$glossy-black-rgb: 19, 5, 21;
$glossy-black-light: mix(#fff, $glossy-black, 20%);
$glossy-black-dark: mix(#000, $glossy-black, 20%);

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