Label images.

src/App.css

@@ -10,4 +10,6 @@ html, body, #root {
 
 .frame {
   display: inline-block;
+  color: #fff;
+  text-shadow: 0 0 4px #000, 0 0 8px #000 ;
 }

src/App.js

@@ -87,6 +87,7 @@ class App extends React.Component {
             onMouseLeave={mouseLeave}
             className="frame"
              style={{backgroundImage: 'url("' + url + '")', ...style}}>
+            <p>{name}</p>
         </div>)
       });
     }