#697684

CSS

:root {
  --made-in-the-shade: #697684;
  --made-in-the-shade-rgb: 105 118 132;
  --made-in-the-shade-oklch: oklch(0.56 0.027 250.3);
}

.element {
  color: var(--made-in-the-shade);
  background-color: hsl(211 11% 46%);
  border-color: oklch(0.56 0.027 250.3);
}

Tailwind CSS v4

@theme {
  --color-made-in-the-shade: #697684;
  --color-made-in-the-shade-50: #f0f6fd;
  --color-made-in-the-shade-100: #e2e9f1;
  --color-made-in-the-shade-200: #ccd5e0;
  --color-made-in-the-shade-300: #aeb9c5;
  --color-made-in-the-shade-400: #93a0ae;
  --color-made-in-the-shade-500: #798898;
  --color-made-in-the-shade-600: #677380;
  --color-made-in-the-shade-700: #525c67;
  --color-made-in-the-shade-800: #3b434b;
  --color-made-in-the-shade-900: #292f34;
  --color-made-in-the-shade-950: #171b20;
}

SCSS

$made-in-the-shade: #697684;
$made-in-the-shade-rgb: 105, 118, 132;
$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);
}