#6770B2

CSS

:root {
  --loch-ness: #6770b2;
  --loch-ness-rgb: 103 112 178;
  --loch-ness-oklch: oklch(0.566 0.102 276.7);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(233 33% 55%);
  border-color: oklch(0.566 0.102 276.7);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6770b2;
  --color-loch-ness-50: #eef3ff;
  --color-loch-ness-100: #e0e5ff;
  --color-loch-ness-200: #cad1ff;
  --color-loch-ness-300: #abb3ec;
  --color-loch-ness-400: #8f99db;
  --color-loch-ness-500: #757fc9;
  --color-loch-ness-600: #636caa;
  --color-loch-ness-700: #4f5688;
  --color-loch-ness-800: #383f66;
  --color-loch-ness-900: #262b47;
  --color-loch-ness-950: #15192f;
}

SCSS

$loch-ness: #6770b2;
$loch-ness-rgb: 103, 112, 178;
$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);
}