Up in Smoke

CSS

:root {
  --up-in-smoke: #6e706d;
  --up-in-smoke-rgb: 110 112 109;
  --up-in-smoke-oklch: oklch(0.542 0.005 134.9);
}

.element {
  color: var(--up-in-smoke);
  background-color: hsl(100 1% 43%);
  border-color: oklch(0.542 0.005 134.9);
}

Tailwind CSS v4

@theme {
  --color-up-in-smoke: #6e706d;
  --color-up-in-smoke-50: #f4f5f4;
  --color-up-in-smoke-100: #e7e8e6;
  --color-up-in-smoke-200: #d3d5d2;
  --color-up-in-smoke-300: #b6b8b5;
  --color-up-in-smoke-400: #9d9f9c;
  --color-up-in-smoke-500: #858783;
  --color-up-in-smoke-600: #70726f;
  --color-up-in-smoke-700: #5a5b59;
  --color-up-in-smoke-800: #424341;
  --color-up-in-smoke-900: #2d2e2d;
  --color-up-in-smoke-950: #1a1b1a;
}

SCSS

$up-in-smoke: #6e706d;
$up-in-smoke-rgb: 110, 112, 109;
$up-in-smoke-light: mix(#fff, $up-in-smoke, 20%);
$up-in-smoke-dark: mix(#000, $up-in-smoke, 20%);

.element {
  color: $up-in-smoke;
  box-shadow: 0 0 0 2px rgba($up-in-smoke, 0.35);
}