#5468B2

CSS

:root {
  --loch-ness: #5468b2;
  --loch-ness-rgb: 84 104 178;
  --loch-ness-oklch: oklch(0.536 0.118 270.6);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(227 38% 51%);
  border-color: oklch(0.536 0.118 270.6);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5468b2;
  --color-loch-ness-50: #e9f4ff;
  --color-loch-ness-100: #dae6ff;
  --color-loch-ness-200: #c3d2ff;
  --color-loch-ness-300: #a3b4f5;
  --color-loch-ness-400: #849ae5;
  --color-loch-ness-500: #6980d4;
  --color-loch-ness-600: #596db3;
  --color-loch-ness-700: #475790;
  --color-loch-ness-800: #31406b;
  --color-loch-ness-900: #212c4c;
  --color-loch-ness-950: #111932;
}

SCSS

$loch-ness: #5468b2;
$loch-ness-rgb: 84, 104, 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);
}