minor enhancements

src/app/app.component.scss

@@ -27,12 +27,14 @@
 .container > .main > .map-button {
     position: absolute;
     bottom: 20px; left: 10px;
+    z-index: 11;
 }
 
 .container > .main > .map {
     position: absolute;
     bottom: 0; left: 0;
     width: 500px;
+    z-index: 10;
 }
 
 #notifications {