#6370B4

CSS

:root {
  --loch-ness: #6370b4;
  --loch-ness-rgb: 99 112 180;
  --loch-ness-oklch: oklch(0.565 0.106 274.3);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(230 35% 55%);
  border-color: oklch(0.565 0.106 274.3);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6370b4;
  --color-loch-ness-50: #ecf3ff;
  --color-loch-ness-100: #dee6ff;
  --color-loch-ness-200: #c8d1ff;
  --color-loch-ness-300: #a8b3ee;
  --color-loch-ness-400: #8b9add;
  --color-loch-ness-500: #7180cc;
  --color-loch-ness-600: #606cac;
  --color-loch-ness-700: #4c568a;
  --color-loch-ness-800: #363f67;
  --color-loch-ness-900: #252c48;
  --color-loch-ness-950: #13192f;
}

SCSS

$loch-ness: #6370b4;
$loch-ness-rgb: 99, 112, 180;
$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);
}