Added elevation to top toolbar and made it "sticky". That means when users scroll, the toolbar will scroll with

src/app/app.component.css

@@ -16,4 +16,12 @@
     top: 2px;
     left: 10px;
     position: relative;
+}
+
+.sidenav-container {
+    z-index: -1 !important;
+}
+
+.top-toolbar {
+    height: 64px;
 }