make page scrollable;

src/css/app.scss

@@ -5,6 +5,11 @@ body {
     background-color: #e7e7e7;
 }
 
+#page-wrapper {
+    max-height: 100vh;
+    overflow-y: scroll;
+}
+
 .tracker-action-button {
     margin-top: 10px;
     padding: 1px 5px 1px 5px;