docs: update content

Author: mrholek

docs/content/helpers/ratio.md

@@ -53,7 +53,7 @@ Each `.ratio-*` class includes a CSS custom property (or CSS variable) in the se
 For example, to create a 2x1 aspect ratio, set `aspect-ratio: 50%` on the `.ratio`.
 
 {{< example class="docs-example-ratios" >}}
-<div class="ratio" style="aspect-ratio: 50%;">
+<div class="ratio" style="--cui-aspect-ratio: 50%;">
   <div>2x1</div>
 </div>
 {{< /example >}}