fix missing unsplash.it background-image for .panel2

Author: caleywoods

05 - Flex Panel Gallery/index-FINISHED.html

@@ -50,7 +50,7 @@
 
 
     .panel1 { background-image:url(https://source.unsplash.com/gYl-UtwNg_I/1500x1500); }
-    .panel2 { background-image:url(https://source.unsplash.com/1CD3fd8kHnE/1500x1500); }
+    .panel2 { background-image:url(https://source.unsplash.com/rFKUFzjPYiQ/1500x1500); }
     .panel3 { background-image:url(https://images.unsplash.com/photo-1465188162913-8fb5709d6d57?ixlib=rb-0.3.5&q=80&fm=jpg&crop=faces&cs=tinysrgb&w=1500&h=1500&fit=crop&s=967e8a713a4e395260793fc8c802901d); }
     .panel4 { background-image:url(https://source.unsplash.com/ITjiVXcwVng/1500x1500); }
     .panel5 { background-image:url(https://source.unsplash.com/3MNzGlQM7qs/1500x1500); }

05 - Flex Panel Gallery/index-START.html

@@ -45,7 +45,7 @@
 
 
     .panel1 { background-image:url(https://source.unsplash.com/gYl-UtwNg_I/1500x1500); }
-    .panel2 { background-image:url(https://source.unsplash.com/1CD3fd8kHnE/1500x1500); }
+    .panel2 { background-image:url(https://source.unsplash.com/rFKUFzjPYiQ/1500x1500); }
     .panel3 { background-image:url(https://images.unsplash.com/photo-1465188162913-8fb5709d6d57?ixlib=rb-0.3.5&q=80&fm=jpg&crop=faces&cs=tinysrgb&w=1500&h=1500&fit=crop&s=967e8a713a4e395260793fc8c802901d); }
     .panel4 { background-image:url(https://source.unsplash.com/ITjiVXcwVng/1500x1500); }
     .panel5 { background-image:url(https://source.unsplash.com/3MNzGlQM7qs/1500x1500); }