#6A7681

CSS

:root {
  --made-in-the-shade: #6a7681;
  --made-in-the-shade-rgb: 106 118 129;
  --made-in-the-shade-oklch: oklch(0.56 0.022 245.9);
}

.element {
  color: var(--made-in-the-shade);
  background-color: hsl(209 10% 46%);
  border-color: oklch(0.56 0.022 245.9);
}

Tailwind CSS v4

@theme {
  --color-made-in-the-shade: #6a7681;
  --color-made-in-the-shade-50: #f0f6fb;
  --color-made-in-the-shade-100: #e2e9ef;
  --color-made-in-the-shade-200: #cdd5de;
  --color-made-in-the-shade-300: #afb9c3;
  --color-made-in-the-shade-400: #94a0ab;
  --color-made-in-the-shade-500: #7a8894;
  --color-made-in-the-shade-600: #68737e;
  --color-made-in-the-shade-700: #535c64;
  --color-made-in-the-shade-800: #3c434a;
  --color-made-in-the-shade-900: #292f33;
  --color-made-in-the-shade-950: #171b1f;
}

SCSS

$made-in-the-shade: #6a7681;
$made-in-the-shade-rgb: 106, 118, 129;
$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);
}