diff --git a/problem.html b/problem.html
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index 0000000..6b894de
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+++ b/problem.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+
+</head>
+<body>
+<main>
+
+    <style>
+        .Shot
+        {
+            transform: perspective(1000px);
+            transform-style: preserve-3d;
+            width:500px;
+            height: 400px;
+            margin:20px auto 0 auto;
+            text-align:center;
+            transition: transform 1s;
+        }
+        .Shot[show="front"]{ transform: perspective(1000px) rotateY(0deg); }
+        .Shot[show="back"] { transform: perspective(1000px) rotateY(180deg); }
+
+
+        .Page
+        {
+            display: inline-block;
+            position: relative;
+            border:20px solid red;
+            transition: transform 1s;
+            transform-style: preserve-3d;
+        }
+        .Page .Front, .Page .Back
+        {
+            float:left;
+            position:absolute;
+            top:0;
+            left:0;
+            backface-visibility: hidden;
+            transform-style: preserve-3d;
+        }
+        .Page .Back
+        {
+            transform: rotateY(180deg);
+        }
+        .Page img
+        {
+            max-width:300px;
+            max-height:300px;
+        }
+
+        .Shadow--Drop::before
+        {
+            transform: rotateX(90deg);
+            backface-visibility: visible;
+            position: absolute;
+            top: 100%;
+            content: " ";
+            display: block;
+            width: 100%;
+            height: 50px;
+            background: #000;
+        }
+
+        .Shadow--Sheet::after
+        {
+            content:" ";
+
+            background-size: 100% 100%;
+            background-position: 0px 0px;
+            background-image: conic-gradient(from 0deg at 0% 0%, #00000000 33%, #000000FF 75%);
+
+            display:block;
+            position:absolute;
+            z-index:100;
+            top:0;
+            left:0;
+            width:100%;
+            height:100%;
+
+            backface-visibility: hidden;
+        }
+        .Shadow--Sheet--Flip::after
+        {
+            transform:scaleX(-1);
+        }
+    </style>
+    <div>
+        <button onclick="bookPose('front')">Front</button>
+        <button onclick="bookPose('back') ">Back </button>
+    </div>
+    <div class="Shot" show="cover">
+        <div class="Page">
+            <div class="Front Shadow--Sheet">
+                <img src="book-page-1.jpg" />
+            </div>
+            <div class="Back Shadow--Sheet Shadow--Sheet--Flip Shadow--Drop">
+                <img src="book-page-2.jpg" />
+            </div>
+        </div>
+    </div>
+
+    <div>
+    </div>
+</main>
+<script>
+    let $ = query => Array.from(document.querySelectorAll(query));
+    let pages = $("[swing]");
+    let table = $(".Shot")[0];
+    let bookOpen = index =>
+    {
+        pages.forEach((p, i)=> p.setAttribute("swing", i>index ? "right" : "left") );
+    };
+    let bookClose = () => 
+    {
+        pages.forEach(p=>p.setAttribute("swing", "closed"));
+    };
+    let bookPose = inPanel => 
+    {
+        table.setAttribute("show", inPanel);
+        bookClose();
+    };
+    </script>
+</body>
+</html>
\ No newline at end of file
