#697683

CSS

:root {
  --made-in-the-shade: #697683;
  --made-in-the-shade-rgb: 105 118 131;
  --made-in-the-shade-oklch: oklch(0.56 0.026 248.3);
}

.element {
  color: var(--made-in-the-shade);
  background-color: hsl(210 11% 46%);
  border-color: oklch(0.56 0.026 248.3);
}

Tailwind CSS v4

@theme {
  --color-made-in-the-shade: #697683;
  --color-made-in-the-shade-50: #f0f6fc;
  --color-made-in-the-shade-100: #e2e9f0;
  --color-made-in-the-shade-200: #ccd5df;
  --color-made-in-the-shade-300: #aeb9c4;
  --color-made-in-the-shade-400: #93a0ad;
  --color-made-in-the-shade-500: #798897;
  --color-made-in-the-shade-600: #67737f;
  --color-made-in-the-shade-700: #525c66;
  --color-made-in-the-shade-800: #3b434b;
  --color-made-in-the-shade-900: #292f34;
  --color-made-in-the-shade-950: #171b1f;
}

SCSS

$made-in-the-shade: #697683;
$made-in-the-shade-rgb: 105, 118, 131;
$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);
}