#6971B5

CSS

:root {
  --loch-ness: #6971b5;
  --loch-ness-rgb: 105 113 181;
  --loch-ness-oklch: oklch(0.572 0.105 277.4);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(234 34% 56%);
  border-color: oklch(0.572 0.105 277.4);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6971b5;
  --color-loch-ness-50: #eef3ff;
  --color-loch-ness-100: #e0e5ff;
  --color-loch-ness-200: #cad0ff;
  --color-loch-ness-300: #acb2ed;
  --color-loch-ness-400: #8f98dc;
  --color-loch-ness-500: #767ecb;
  --color-loch-ness-600: #646bab;
  --color-loch-ness-700: #4f5689;
  --color-loch-ness-800: #383f66;
  --color-loch-ness-900: #262b48;
  --color-loch-ness-950: #15182f;
}

SCSS

$loch-ness: #6971b5;
$loch-ness-rgb: 105, 113, 181;
$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);
}