Aesthetic changes to map layers control

lib/www/client/source/src/views/Map.vue

@@ -11,7 +11,7 @@
         <v-icon>mdi-menu</v-icon>
       </div>
       <div class="map-overlay-inner">
-        <h3>Layers</h3>
+        <h3>Background</h3>
         <form>
           <input id="lyr-osm" type="checkbox" value="osm" v-model="layerSelection"/>
           <label for="lyr-osm">OpenStreetMap</label>
@@ -25,6 +25,8 @@
 
         <hr class="my-2"/>
 
+        <h3>Layers</h3>
+
         <div class="lines-points">
 
           <span>Vessel track</span>