diff --git a/README.md b/README.md
index 96cbbe4..81005b2 100644
--- a/README.md
+++ b/README.md
@@ -120,7 +120,11 @@ How to Use
 
 ```html
 <style>
-  #Demo { position: 'relative'; }
+  #Demo { 
+    position: 'relative';
+    height: 100%; // Or whatever you want (eg. 400px)
+    overflow: hidden;
+  }
 </style>
 <div id='Demo'>
   <div>