Edge of Black

CSS

:root {
  --edge-of-black: #54585e;
  --edge-of-black-rgb: 84 88 94;
  --edge-of-black-oklch: oklch(0.459 0.011 258.4);
}

.element {
  color: var(--edge-of-black);
  background-color: hsl(216 6% 35%);
  border-color: oklch(0.459 0.011 258.4);
}

Tailwind CSS v4

@theme {
  --color-edge-of-black: #54585e;
  --color-edge-of-black-50: #f3f5f8;
  --color-edge-of-black-100: #e6e8ec;
  --color-edge-of-black-200: #d1d4d9;
  --color-edge-of-black-300: #b4b8bd;
  --color-edge-of-black-400: #9a9fa5;
  --color-edge-of-black-500: #82868e;
  --color-edge-of-black-600: #6e7278;
  --color-edge-of-black-700: #585b60;
  --color-edge-of-black-800: #404346;
  --color-edge-of-black-900: #2c2e31;
  --color-edge-of-black-950: #191b1d;
}

SCSS

$edge-of-black: #54585e;
$edge-of-black-rgb: 84, 88, 94;
$edge-of-black-light: mix(#fff, $edge-of-black, 20%);
$edge-of-black-dark: mix(#000, $edge-of-black, 20%);

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