#546AAA

CSS

:root {
  --loch-ness: #546aaa;
  --loch-ness-rgb: 84 106 170;
  --loch-ness-oklch: oklch(0.536 0.104 268.4);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(225 34% 50%);
  border-color: oklch(0.536 0.104 268.4);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #546aaa;
  --color-loch-ness-50: #e9f4ff;
  --color-loch-ness-100: #dae7ff;
  --color-loch-ness-200: #c3d3ff;
  --color-loch-ness-300: #a3b5ee;
  --color-loch-ness-400: #849cdd;
  --color-loch-ness-500: #6982cb;
  --color-loch-ness-600: #596eac;
  --color-loch-ness-700: #47588a;
  --color-loch-ness-800: #324167;
  --color-loch-ness-900: #222d48;
  --color-loch-ness-950: #111a2f;
}

SCSS

$loch-ness: #546aaa;
$loch-ness-rgb: 84, 106, 170;
$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);
}