diff --git a/www/examples/animations.md b/www/examples/animations.md
index 84249e31..8f5f2605 100644
--- a/www/examples/animations.md
+++ b/www/examples/animations.md
@@ -62,7 +62,7 @@ phase.
   transition: opacity 1s ease-out;
 }
 </style>
-<button class="fade-me-in"
+<button id="fade-me-in"
         hx-post="/fade_in_demo"
         hx-swap="outerHTML settle:1s">
         Fade Me In
@@ -176,4 +176,4 @@ being updated smoothly.
 
 #### Conclusion
 
-You can use the tools above to create quite a few interesting and pleasing effects with plain old HTML while using htmx.
\ No newline at end of file
+You can use the tools above to create quite a few interesting and pleasing effects with plain old HTML while using htmx.