Fade the map in after it is done loading

src/index.js

@@ -75,6 +75,12 @@ const RecordSheet = new function () {
   };
 };
 
+const mapPlaceholder = document.querySelector('.map-placeholder');
+document.querySelector('object').addEventListener('load', function () {
+  mapPlaceholder.remove();
+  this.style.opacity = 1;
+});
+
 window.addEventListener('load', () => {
   const svg = document.querySelector('object').contentDocument.querySelector('svg'),
     game = new Game(svg);