#5467B9

CSS

:root {
  --loch-ness: #5467b9;
  --loch-ness-rgb: 84 103 185;
  --loch-ness-oklch: oklch(0.539 0.13 271.6);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(229 42% 53%);
  border-color: oklch(0.539 0.13 271.6);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5467b9;
  --color-loch-ness-50: #e9f3ff;
  --color-loch-ness-100: #dae6ff;
  --color-loch-ness-200: #c2d1ff;
  --color-loch-ness-300: #a2b3fa;
  --color-loch-ness-400: #8399eb;
  --color-loch-ness-500: #687edb;
  --color-loch-ness-600: #586bb9;
  --color-loch-ness-700: #465695;
  --color-loch-ness-800: #313f6f;
  --color-loch-ness-900: #212b4e;
  --color-loch-ness-950: #111834;
}

SCSS

$loch-ness: #5467b9;
$loch-ness-rgb: 84, 103, 185;
$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);
}