Update z-index.mdx

Author: coliff

site/src/content/docs/utilities/z-index.mdx

@@ -14,11 +14,11 @@ Use `z-index` utilities to stack elements on top of one another. Requires a `pos
 We call these “low-level” `z-index` utilities because of their default values of `-1` through `3`, which we use for the layout of overlapping components. High-level `z-index` values are used for overlay components like modals and tooltips.
 </Callout>
 
-<Example class="bd-example-zindex-levels position-relative" code={`<div class="z-3 position-absolute p-5 rounded-3"><span>z-3</span></div>
-<div class="z-2 position-absolute p-5 rounded-3"><span>z-2</span></div>
-<div class="z-1 position-absolute p-5 rounded-3"><span>z-1</span></div>
-<div class="z-0 position-absolute p-5 rounded-3"><span>z-0</span></div>
-<div class="z-n1 position-absolute p-5 rounded-3"><span>z-n1</span></div>`} />
+<Example class="bd-example-zindex-levels position-relative" code={`<div class="z-3 position-absolute p-9 rounded-3"><span>z-3</span></div>
+<div class="z-2 position-absolute p-9 rounded-3"><span>z-2</span></div>
+<div class="z-1 position-absolute p-9 rounded-3"><span>z-1</span></div>
+<div class="z-0 position-absolute p-9 rounded-3"><span>z-0</span></div>
+<div class="z-n1 position-absolute p-9 rounded-3"><span>z-n1</span></div>`} />
 
 ## Overlays