Restore image fade in functionality

js/image.js

@@ -0,0 +1,18 @@
+export default class Image {
+  constructor(image) {
+    this.image = image;
+  }
+
+  showImage() {
+    this.image.style.opacity = 1;
+  }
+
+  fadeIn() {
+    this.image.style.opacity = 0;
+    this.attachLoadedEvent();
+  }
+
+  attachLoadedEvent() {
+    this.image.addEventListener('load', () => this.showImage());
+  }
+}