Added drop shadow to header toolbar.

resources/report/css/overrides.css

@@ -1,5 +1,10 @@
 /* These styles override Polymer's own internal styling for certain elements. */
 
+/* The following stops the main toolbar from overshadowing into the drawer. */
+#container::shadow #drawer {
+    z-index: 1;
+}
+
 /* The following is for setting the size of the drawer in narrow mode. */
 #container::shadow .narrow-layout #drawer {
     width: 50% !important;

resources/report/css/style.css

@@ -35,6 +35,10 @@ core-toolbar {
     color: white;
     height: 56px;
 }
+#mainToolbar {
+    box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.26);
+    z-index: 1;
+}
 #mainToolbar paper-dropdown {
     color: black;
 }