@@ -1,10 +1,12 @@
 <!DOCTYPE html>
 <html lang="en">
+
 <head>
   <meta charset="UTF-8">
   <title>Flex Panels 💪</title>
   <link href='https://fonts.googleapis.com/css?family=Amatic+SC' rel='stylesheet' type='text/css'>
 </head>
+
 <body>
   <style>
     html {
@@ -14,48 +16,90 @@
       font-size: 20px;
       font-weight: 200;
     }
-    
+
     body {
       margin: 0;
     }
-    
-    *, *:before, *:after {
+
+    *,
+    *:before,
+    *:after {
       box-sizing: inherit;
     }
 
     .panels {
       min-height: 100vh;
       overflow: hidden;
+      display: flex;
     }
 
     .panel {
       background: #6B0F9C;
-      box-shadow: inset 0 0 0 5px rgba(255,255,255,0.1);
+      box-shadow: inset 0 0 0 5px rgba(255, 255, 255, 0.1);
       color: white;
       text-align: center;
       align-items: center;
       /* Safari transitionend event.propertyName === flex */
       /* Chrome + FF transitionend event.propertyName === flex-grow */
       transition:
-        font-size 0.7s cubic-bezier(0.61,-0.19, 0.7,-0.11),
-        flex 0.7s cubic-bezier(0.61,-0.19, 0.7,-0.11),
+        font-size 0.7s cubic-bezier(0.61, -0.19, 0.7, -0.11),
+        flex 0.7s cubic-bezier(0.61, -0.19, 0.7, -0.11),
         background 0.2s;
       font-size: 20px;
       background-size: cover;
       background-position: center;
+      display: flex;
+      flex-direction: column;
+      justify-content: center;
+      align-items: center;
+      flex: 1;
+    }
+
+    .panel1 {
+      background-image: url(https://source.unsplash.com/gYl-UtwNg_I/1500x1500);
     }
 
-    .panel1 { background-image:url(https://source.unsplash.com/gYl-UtwNg_I/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); }
+    .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);
+    }
 
     /* Flex Children */
-    .panel > * {
+    .panel>* {
       margin: 0;
       width: 100%;
       transition: transform 0.5s;
+      flex: 1 0 auto;
+      display: flex;
+      justify-content: center;
+      align-items: center;
+    }
+
+    .panel>*:first-child {
+      transform: translateY(-100%);
+    }
+
+    .panel.open-active>*:first-child {
+      transform: translateY(0);
+    }
+
+    .panel>*:last-child {
+      transform: translateY(100%);
+    }
+
+    .panel.open-active>*:last-child {
+      transform: translateY(0);
     }
 
     .panel p {
@@ -64,15 +108,15 @@
       text-shadow: 0 0 4px rgba(0, 0, 0, 0.72), 0 0 14px rgba(0, 0, 0, 0.45);
       font-size: 2em;
     }
-    
+
     .panel p:nth-child(2) {
       font-size: 4em;
     }
 
     .panel.open {
+      flex: 5;
       font-size: 40px;
     }
-
   </style>
 
 
@@ -105,10 +149,21 @@
   </div>
 
   <script>
-
+      const panels = document.querySelectorAll('.panel');
+       function toggleOpen() {
+         this.classList.toggle('open');
+       }
+       function toggleActive(e) {
+        //  console.log(e.propertyName);
+         if(e.propertyName.includes('flex'))
+            this.classList.toggle('open-active');
+       }
+       panels.forEach(panel => panel.addEventListener('click',toggleOpen));
+       panels.forEach(panel => panel.addEventListener('transitionend',toggleActive));
   </script>
 
 
 
 </body>
-</html>
+
+</html>