#686C75

CSS

:root {
  --made-in-the-shade: #686c75;
  --made-in-the-shade-rgb: 104 108 117;
  --made-in-the-shade-oklch: oklch(0.531 0.015 266.6);
}

.element {
  color: var(--made-in-the-shade);
  background-color: hsl(222 6% 43%);
  border-color: oklch(0.531 0.015 266.6);
}

Tailwind CSS v4

@theme {
  --color-made-in-the-shade: #686c75;
  --color-made-in-the-shade-50: #f3f5fa;
  --color-made-in-the-shade-100: #e6e8ed;
  --color-made-in-the-shade-200: #d1d4db;
  --color-made-in-the-shade-300: #b4b7bf;
  --color-made-in-the-shade-400: #9a9ea8;
  --color-made-in-the-shade-500: #828690;
  --color-made-in-the-shade-600: #6e727a;
  --color-made-in-the-shade-700: #585b62;
  --color-made-in-the-shade-800: #404248;
  --color-made-in-the-shade-900: #2c2e32;
  --color-made-in-the-shade-950: #191b1e;
}

SCSS

$made-in-the-shade: #686c75;
$made-in-the-shade-rgb: 104, 108, 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);
}