Fix padding on Sky home screen scrollable list

sky/sdk/home.dart

Index: sky/sdk/home.dart
diff --git a/sky/sdk/home.dart b/sky/sdk/home.dart
index aad73300d9b15f4349bf0f44ac0570514befaca1..5cce0dfb23ad0dda6c8d781319eee14631dff8f6 100644
--- a/sky/sdk/home.dart
+++ b/sky/sdk/home.dart
@@ -106,9 +106,10 @@ List<Widget> demos = [
 ];
 
 const double kCardHeight = 120.0;
+const EdgeDims kListPadding = const EdgeDims.all(4.0);
 
 class DemoList extends FixedHeightScrollable {
-  DemoList({ String key }) : super(key: key, itemHeight: kCardHeight) {
+  DemoList({ String key }) : super(key: key, itemHeight: kCardHeight, padding: kListPadding) {
     itemCount = demos.length;
   }