#5369AF

CSS

:root {
  --loch-ness: #5369af;
  --loch-ness-rgb: 83 105 175;
  --loch-ness-oklch: oklch(0.536 0.113 269.2);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(226 37% 51%);
  border-color: oklch(0.536 0.113 269.2);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5369af;
  --color-loch-ness-50: #e9f4ff;
  --color-loch-ness-100: #dae7ff;
  --color-loch-ness-200: #c2d2ff;
  --color-loch-ness-300: #a2b5f2;
  --color-loch-ness-400: #839be2;
  --color-loch-ness-500: #6881d1;
  --color-loch-ness-600: #586eb0;
  --color-loch-ness-700: #46588e;
  --color-loch-ness-800: #31406a;
  --color-loch-ness-900: #212c4a;
  --color-loch-ness-950: #111931;
}

SCSS

$loch-ness: #5369af;
$loch-ness-rgb: 83, 105, 175;
$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);
}