[css-transforms-2] Restore some missing parts of an example.

This copies a few styles from the previous example that are also needed
in this one.

Author: dbaron

css-transforms-2/Overview.bs

@@ -355,8 +355,13 @@ Note: Because the 3D-transformed elements in a 3D rendering context can all dept
 <div class="example">
 	<pre>
 	&lt;style>
+	div {
+		height: 150px;
+		width: 150px;
+	}
 	.scene {
 		background-color: rgba(0, 0, 0, 0.3);
+		border: 1px solid black;
 		perspective: 500px;
 	}
 	.container {
@@ -382,6 +387,7 @@ Note: Because the 3D-transformed elements in a 3D rendering context can all dept
 
 	&lt;div class="scene">
 	  &lt;div class="container">
+	    Lorem ipsum dolor sit amet, consectetaur adipisicing elit&hellip;
 	    &lt;div>&lt;/div>
 	    &lt;div>&lt;/div>
 	  &lt;/div>