margin bottom on parent slider

docs/examples/app-movies/css/app.css

@@ -1,7 +1,9 @@
+.slider {
+  margin-bottom: 0;
+}
 .slider img {
   width: auto;
   height: 150px;
-  margin-bottom: 0;
 }
 .content-padded {
   margin: 30px 15px 15px;