#6470B6

CSS

:root {
  --loch-ness: #6470b6;
  --loch-ness-rgb: 100 112 182;
  --loch-ness-oklch: oklch(0.566 0.109 275);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(231 36% 55%);
  border-color: oklch(0.566 0.109 275);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6470b6;
  --color-loch-ness-50: #edf3ff;
  --color-loch-ness-100: #dee5ff;
  --color-loch-ness-200: #c8d1ff;
  --color-loch-ness-300: #a9b3ef;
  --color-loch-ness-400: #8c99df;
  --color-loch-ness-500: #727fce;
  --color-loch-ness-600: #606cae;
  --color-loch-ness-700: #4d568b;
  --color-loch-ness-800: #363f68;
  --color-loch-ness-900: #252c49;
  --color-loch-ness-950: #141930;
}

SCSS

$loch-ness: #6470b6;
$loch-ness-rgb: 100, 112, 182;
$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);
}