#666D75

CSS

:root {
  --made-in-the-shade: #666d75;
  --made-in-the-shade-rgb: 102 109 117;
  --made-in-the-shade-oklch: oklch(0.532 0.015 251.7);
}

.element {
  color: var(--made-in-the-shade);
  background-color: hsl(212 7% 43%);
  border-color: oklch(0.532 0.015 251.7);
}

Tailwind CSS v4

@theme {
  --color-made-in-the-shade: #666d75;
  --color-made-in-the-shade-50: #f2f5f9;
  --color-made-in-the-shade-100: #e4e8ed;
  --color-made-in-the-shade-200: #d0d5db;
  --color-made-in-the-shade-300: #b2b8bf;
  --color-made-in-the-shade-400: #989fa7;
  --color-made-in-the-shade-500: #7f8790;
  --color-made-in-the-shade-600: #6c727a;
  --color-made-in-the-shade-700: #565b62;
  --color-made-in-the-shade-800: #3e4348;
  --color-made-in-the-shade-900: #2b2e32;
  --color-made-in-the-shade-950: #181b1e;
}

SCSS

$made-in-the-shade: #666d75;
$made-in-the-shade-rgb: 102, 109, 117;
$made-in-the-shade-light: mix(#fff, $made-in-the-shade, 20%);
$made-in-the-shade-dark: mix(#000, $made-in-the-shade, 20%);

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