#6C7583

CSS

:root {
  --made-in-the-shade: #6c7583;
  --made-in-the-shade-rgb: 108 117 131;
  --made-in-the-shade-oklch: oklch(0.56 0.024 259.2);
}

.element {
  color: var(--made-in-the-shade);
  background-color: hsl(217 10% 47%);
  border-color: oklch(0.56 0.024 259.2);
}

Tailwind CSS v4

@theme {
  --color-made-in-the-shade: #6c7583;
  --color-made-in-the-shade-50: #f1f5fc;
  --color-made-in-the-shade-100: #e3e8f0;
  --color-made-in-the-shade-200: #ced5df;
  --color-made-in-the-shade-300: #b0b8c4;
  --color-made-in-the-shade-400: #969fad;
  --color-made-in-the-shade-500: #7d8797;
  --color-made-in-the-shade-600: #6a727f;
  --color-made-in-the-shade-700: #545b66;
  --color-made-in-the-shade-800: #3d434b;
  --color-made-in-the-shade-900: #2a2e34;
  --color-made-in-the-shade-950: #181b1f;
}

SCSS

$made-in-the-shade: #6c7583;
$made-in-the-shade-rgb: 108, 117, 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);
}