#656D75

CSS

:root {
  --made-in-the-shade: #656d75;
  --made-in-the-shade-rgb: 101 109 117;
  --made-in-the-shade-oklch: oklch(0.531 0.016 248.1);
}

.element {
  color: var(--made-in-the-shade);
  background-color: hsl(210 7% 43%);
  border-color: oklch(0.531 0.016 248.1);
}

Tailwind CSS v4

@theme {
  --color-made-in-the-shade: #656d75;
  --color-made-in-the-shade-50: #f2f6fa;
  --color-made-in-the-shade-100: #e4e8ed;
  --color-made-in-the-shade-200: #cfd5db;
  --color-made-in-the-shade-300: #b1b8bf;
  --color-made-in-the-shade-400: #979fa8;
  --color-made-in-the-shade-500: #7e8790;
  --color-made-in-the-shade-600: #6b737a;
  --color-made-in-the-shade-700: #555c62;
  --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: #656d75;
$made-in-the-shade-rgb: 101, 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);
}