#5667B7

CSS

:root {
  --loch-ness: #5667b7;
  --loch-ness-rgb: 86 103 183;
  --loch-ness-oklch: oklch(0.539 0.126 272.5);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(229 40% 53%);
  border-color: oklch(0.539 0.126 272.5);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5667b7;
  --color-loch-ness-50: #eaf3ff;
  --color-loch-ness-100: #dbe6ff;
  --color-loch-ness-200: #c3d1ff;
  --color-loch-ness-300: #a4b3f8;
  --color-loch-ness-400: #8599e9;
  --color-loch-ness-500: #6a7ed9;
  --color-loch-ness-600: #5a6bb7;
  --color-loch-ness-700: #485693;
  --color-loch-ness-800: #323f6e;
  --color-loch-ness-900: #222b4d;
  --color-loch-ness-950: #111833;
}

SCSS

$loch-ness: #5667b7;
$loch-ness-rgb: 86, 103, 183;
$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);
}