#6372AB

CSS

:root {
  --loch-ness: #6372ab;
  --loch-ness-rgb: 99 114 171;
  --loch-ness-oklch: oklch(0.564 0.09 272);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(228 30% 53%);
  border-color: oklch(0.564 0.09 272);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6372ab;
  --color-loch-ness-50: #edf4ff;
  --color-loch-ness-100: #dee6ff;
  --color-loch-ness-200: #c8d2fc;
  --color-loch-ness-300: #a9b5e6;
  --color-loch-ness-400: #8b9bd4;
  --color-loch-ness-500: #7182c2;
  --color-loch-ness-600: #606ea4;
  --color-loch-ness-700: #4d5884;
  --color-loch-ness-800: #364162;
  --color-loch-ness-900: #252d45;
  --color-loch-ness-950: #14192c;
}

SCSS

$loch-ness: #6372ab;
$loch-ness-rgb: 99, 114, 171;
$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);
}