#5B70BE

CSS

:root {
  --loch-ness: #5b70be;
  --loch-ness-rgb: 91 112 190;
  --loch-ness-oklch: oklch(0.565 0.123 270.7);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(227 43% 55%);
  border-color: oklch(0.565 0.123 270.7);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5b70be;
  --color-loch-ness-50: #e9f4ff;
  --color-loch-ness-100: #dae6ff;
  --color-loch-ness-200: #c2d2ff;
  --color-loch-ness-300: #a2b4f7;
  --color-loch-ness-400: #839ae7;
  --color-loch-ness-500: #6880d7;
  --color-loch-ness-600: #586cb6;
  --color-loch-ness-700: #465692;
  --color-loch-ness-800: #31406d;
  --color-loch-ness-900: #212c4d;
  --color-loch-ness-950: #111933;
}

SCSS

$loch-ness: #5b70be;
$loch-ness-rgb: 91, 112, 190;
$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);
}