#687682

CSS

:root {
  --made-in-the-shade: #687682;
  --made-in-the-shade-rgb: 104 118 130;
  --made-in-the-shade-oklch: oklch(0.558 0.025 244.1);
}

.element {
  color: var(--made-in-the-shade);
  background-color: hsl(208 11% 46%);
  border-color: oklch(0.558 0.025 244.1);
}

Tailwind CSS v4

@theme {
  --color-made-in-the-shade: #687682;
  --color-made-in-the-shade-50: #f0f6fc;
  --color-made-in-the-shade-100: #e1e9f0;
  --color-made-in-the-shade-200: #ccd6df;
  --color-made-in-the-shade-300: #adb9c4;
  --color-made-in-the-shade-400: #92a0ad;
  --color-made-in-the-shade-500: #798896;
  --color-made-in-the-shade-600: #66737f;
  --color-made-in-the-shade-700: #525c66;
  --color-made-in-the-shade-800: #3b444a;
  --color-made-in-the-shade-900: #282f34;
  --color-made-in-the-shade-950: #161b1f;
}

SCSS

$made-in-the-shade: #687682;
$made-in-the-shade-rgb: 104, 118, 130;
$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);
}