#536AAB

CSS

:root {
  --loch-ness: #536aab;
  --loch-ness-rgb: 83 106 171;
  --loch-ness-oklch: oklch(0.536 0.106 268);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(224 35% 50%);
  border-color: oklch(0.536 0.106 268);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #536aab;
  --color-loch-ness-50: #e9f5ff;
  --color-loch-ness-100: #dae7ff;
  --color-loch-ness-200: #c2d3ff;
  --color-loch-ness-300: #a2b5ee;
  --color-loch-ness-400: #839cde;
  --color-loch-ness-500: #6882cc;
  --color-loch-ness-600: #586fad;
  --color-loch-ness-700: #46588b;
  --color-loch-ness-800: #314167;
  --color-loch-ness-900: #212d48;
  --color-loch-ness-950: #111a2f;
}

SCSS

$loch-ness: #536aab;
$loch-ness-rgb: 83, 106, 171;
$loch-ness-light: mix(#fff, $loch-ness, 20%);
$loch-ness-dark: mix(#000, $loch-ness, 20%);

.element {
  color: $loch-ness;
  box-shadow: 0 0 0 2px rgba($loch-ness, 0.35);
}