#697681

CSS

:root {
  --made-in-the-shade: #697681;
  --made-in-the-shade-rgb: 105 118 129;
  --made-in-the-shade-oklch: oklch(0.559 0.023 243.7);
}

.element {
  color: var(--made-in-the-shade);
  background-color: hsl(207 10% 46%);
  border-color: oklch(0.559 0.023 243.7);
}

Tailwind CSS v4

@theme {
  --color-made-in-the-shade: #697681;
  --color-made-in-the-shade-50: #f0f6fb;
  --color-made-in-the-shade-100: #e2e9ef;
  --color-made-in-the-shade-200: #ccd5de;
  --color-made-in-the-shade-300: #aeb9c3;
  --color-made-in-the-shade-400: #93a0ab;
  --color-made-in-the-shade-500: #7a8895;
  --color-made-in-the-shade-600: #67737e;
  --color-made-in-the-shade-700: #525c65;
  --color-made-in-the-shade-800: #3c444a;
  --color-made-in-the-shade-900: #292f33;
  --color-made-in-the-shade-950: #171b1f;
}

SCSS

$made-in-the-shade: #697681;
$made-in-the-shade-rgb: 105, 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);
}