#5669AA

CSS

:root {
  --loch-ness: #5669aa;
  --loch-ness-rgb: 86 105 170;
  --loch-ness-oklch: oklch(0.535 0.105 270.2);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(226 33% 50%);
  border-color: oklch(0.535 0.105 270.2);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5669aa;
  --color-loch-ness-50: #eaf4ff;
  --color-loch-ness-100: #dbe7ff;
  --color-loch-ness-200: #c4d2ff;
  --color-loch-ness-300: #a5b5ee;
  --color-loch-ness-400: #879bdd;
  --color-loch-ness-500: #6c82cc;
  --color-loch-ness-600: #5b6eac;
  --color-loch-ness-700: #49588a;
  --color-loch-ness-800: #334067;
  --color-loch-ness-900: #232c48;
  --color-loch-ness-950: #12192f;
}

SCSS

$loch-ness: #5669aa;
$loch-ness-rgb: 86, 105, 170;
$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);
}