#666BC8

CSS

:root {
  --loch-ness: #666bc8;
  --loch-ness-rgb: 102 107 200;
  --loch-ness-oklch: oklch(0.568 0.141 278.6);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(237 47% 59%);
  border-color: oklch(0.568 0.141 278.6);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #666bc8;
  --color-loch-ness-50: #edf1ff;
  --color-loch-ness-100: #dee3ff;
  --color-loch-ness-200: #c8ceff;
  --color-loch-ness-300: #aaaffe;
  --color-loch-ness-400: #8c94f0;
  --color-loch-ness-500: #7379e1;
  --color-loch-ness-600: #6266be;
  --color-loch-ness-700: #4e5299;
  --color-loch-ness-800: #363c72;
  --color-loch-ness-900: #252951;
  --color-loch-ness-950: #141736;
}

SCSS

$loch-ness: #666bc8;
$loch-ness-rgb: 102, 107, 200;
$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);
}