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diff --git a/Sample/chapter-15-sample/css/960_12_col.css b/Sample/chapter-15-sample/css/960_12_col.css
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+++ b/Sample/chapter-15-sample/css/960_12_col.css
@@ -0,0 +1,357 @@
+/*
+  960 Grid System ~ Core CSS.
+  Learn more ~ http://960.gs/
+
+  Licensed under GPL and MIT.
+*/
+
+/*
+  Forces backgrounds to span full width,
+  even if there is horizontal scrolling.
+  Increase this if your layout is wider.
+
+  Note: IE6 works fine without this fix.
+*/
+
+body {
+    min-width: 960px;
+  }
+  
+  /* `Container
+  ----------------------------------------------------------------------------------------------------*/
+  
+  .container_12 {
+    margin-left: auto;
+    margin-right: auto;
+    width: 960px;
+  }
+  
+  /* `Grid >> Global
+  ----------------------------------------------------------------------------------------------------*/
+  
+  .grid_1,
+  .grid_2,
+  .grid_3,
+  .grid_4,
+  .grid_5,
+  .grid_6,
+  .grid_7,
+  .grid_8,
+  .grid_9,
+  .grid_10,
+  .grid_11,
+  .grid_12 {
+    display: inline;
+    float: left;
+    margin-left: 10px;
+    margin-right: 10px;
+  }
+  
+  .push_1, .pull_1,
+  .push_2, .pull_2,
+  .push_3, .pull_3,
+  .push_4, .pull_4,
+  .push_5, .pull_5,
+  .push_6, .pull_6,
+  .push_7, .pull_7,
+  .push_8, .pull_8,
+  .push_9, .pull_9,
+  .push_10, .pull_10,
+  .push_11, .pull_11 {
+    position: relative;
+  }
+  
+  /* `Grid >> Children (Alpha ~ First, Omega ~ Last)
+  ----------------------------------------------------------------------------------------------------*/
+  
+  .alpha {
+    margin-left: 0;
+  }
+  
+  .omega {
+    margin-right: 0;
+  }
+  
+  /* `Grid >> 12 Columns
+  ----------------------------------------------------------------------------------------------------*/
+  
+  .container_12 .grid_1 {
+    width: 60px;
+  }
+  
+  .container_12 .grid_2 {
+    width: 140px;
+  }
+  
+  .container_12 .grid_3 {
+    width: 220px;
+  }
+  
+  .container_12 .grid_4 {
+    width: 300px;
+  }
+  
+  .container_12 .grid_5 {
+    width: 380px;
+  }
+  
+  .container_12 .grid_6 {
+    width: 460px;
+  }
+  
+  .container_12 .grid_7 {
+    width: 540px;
+  }
+  
+  .container_12 .grid_8 {
+    width: 620px;
+  }
+  
+  .container_12 .grid_9 {
+    width: 700px;
+  }
+  
+  .container_12 .grid_10 {
+    width: 780px;
+  }
+  
+  .container_12 .grid_11 {
+    width: 860px;
+  }
+  
+  .container_12 .grid_12 {
+    width: 940px;
+  }
+  
+  /* `Prefix Extra Space >> 12 Columns
+  ----------------------------------------------------------------------------------------------------*/
+  
+  .container_12 .prefix_1 {
+    padding-left: 80px;
+  }
+  
+  .container_12 .prefix_2 {
+    padding-left: 160px;
+  }
+  
+  .container_12 .prefix_3 {
+    padding-left: 240px;
+  }
+  
+  .container_12 .prefix_4 {
+    padding-left: 320px;
+  }
+  
+  .container_12 .prefix_5 {
+    padding-left: 400px;
+  }
+  
+  .container_12 .prefix_6 {
+    padding-left: 480px;
+  }
+  
+  .container_12 .prefix_7 {
+    padding-left: 560px;
+  }
+  
+  .container_12 .prefix_8 {
+    padding-left: 640px;
+  }
+  
+  .container_12 .prefix_9 {
+    padding-left: 720px;
+  }
+  
+  .container_12 .prefix_10 {
+    padding-left: 800px;
+  }
+  
+  .container_12 .prefix_11 {
+    padding-left: 880px;
+  }
+  
+  /* `Suffix Extra Space >> 12 Columns
+  ----------------------------------------------------------------------------------------------------*/
+  
+  .container_12 .suffix_1 {
+    padding-right: 80px;
+  }
+  
+  .container_12 .suffix_2 {
+    padding-right: 160px;
+  }
+  
+  .container_12 .suffix_3 {
+    padding-right: 240px;
+  }
+  
+  .container_12 .suffix_4 {
+    padding-right: 320px;
+  }
+  
+  .container_12 .suffix_5 {
+    padding-right: 400px;
+  }
+  
+  .container_12 .suffix_6 {
+    padding-right: 480px;
+  }
+  
+  .container_12 .suffix_7 {
+    padding-right: 560px;
+  }
+  
+  .container_12 .suffix_8 {
+    padding-right: 640px;
+  }
+  
+  .container_12 .suffix_9 {
+    padding-right: 720px;
+  }
+  
+  .container_12 .suffix_10 {
+    padding-right: 800px;
+  }
+  
+  .container_12 .suffix_11 {
+    padding-right: 880px;
+  }
+  
+  /* `Push Space >> 12 Columns
+  ----------------------------------------------------------------------------------------------------*/
+  
+  .container_12 .push_1 {
+    left: 80px;
+  }
+  
+  .container_12 .push_2 {
+    left: 160px;
+  }
+  
+  .container_12 .push_3 {
+    left: 240px;
+  }
+  
+  .container_12 .push_4 {
+    left: 320px;
+  }
+  
+  .container_12 .push_5 {
+    left: 400px;
+  }
+  
+  .container_12 .push_6 {
+    left: 480px;
+  }
+  
+  .container_12 .push_7 {
+    left: 560px;
+  }
+  
+  .container_12 .push_8 {
+    left: 640px;
+  }
+  
+  .container_12 .push_9 {
+    left: 720px;
+  }
+  
+  .container_12 .push_10 {
+    left: 800px;
+  }
+  
+  .container_12 .push_11 {
+    left: 880px;
+  }
+  
+  /* `Pull Space >> 12 Columns
+  ----------------------------------------------------------------------------------------------------*/
+  
+  .container_12 .pull_1 {
+    left: -80px;
+  }
+  
+  .container_12 .pull_2 {
+    left: -160px;
+  }
+  
+  .container_12 .pull_3 {
+    left: -240px;
+  }
+  
+  .container_12 .pull_4 {
+    left: -320px;
+  }
+  
+  .container_12 .pull_5 {
+    left: -400px;
+  }
+  
+  .container_12 .pull_6 {
+    left: -480px;
+  }
+  
+  .container_12 .pull_7 {
+    left: -560px;
+  }
+  
+  .container_12 .pull_8 {
+    left: -640px;
+  }
+  
+  .container_12 .pull_9 {
+    left: -720px;
+  }
+  
+  .container_12 .pull_10 {
+    left: -800px;
+  }
+  
+  .container_12 .pull_11 {
+    left: -880px;
+  }
+  
+  /* `Clear Floated Elements
+  ----------------------------------------------------------------------------------------------------*/
+  
+  /* http://sonspring.com/journal/clearing-floats */
+  
+  .clear {
+    clear: both;
+    display: block;
+    overflow: hidden;
+    visibility: hidden;
+    width: 0;
+    height: 0;
+  }
+  
+  /* http://www.yuiblog.com/blog/2010/09/27/clearfix-reloaded-overflowhidden-demystified */
+  
+  .clearfix:before,
+  .clearfix:after,
+  .container_12:before,
+  .container_12:after {
+    content: '.';
+    display: block;
+    overflow: hidden;
+    visibility: hidden;
+    font-size: 0;
+    line-height: 0;
+    width: 0;
+    height: 0;
+  }
+  
+  .clearfix:after,
+  .container_12:after {
+    clear: both;
+  }
+  
+  /*
+    The following zoom:1 rule is specifically for IE6 + IE7.
+    Move to separate stylesheet if invalid CSS is a problem.
+  */
+  
+  .clearfix,
+  .container_12 {
+    zoom: 1;
+  }
\ No newline at end of file
diff --git a/Sample/chapter-15-sample/index.html b/Sample/chapter-15-sample/index.html
new file mode 100644
index 0000000..e23d09e
--- /dev/null
+++ b/Sample/chapter-15-sample/index.html
@@ -0,0 +1,190 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Layout</title>
+    <link rel="stylesheet" type="text/css" href="./css/960_12_col.css" />
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Cabin:wght@400;500;700&display=swap" rel="stylesheet">
+    <style type="text/css">
+
+        body {
+            color: #ffffff;
+            background: #413f3b;
+            font-family: 'Cabin', sans-serif;
+            font-size: 90%;
+            margin: 0px;
+            text-align: center;
+        }
+
+        a {
+            color: #b5c1ad;
+            text-decoration: none;
+        }
+
+        a:hover {
+            color: #ffffff;
+        }
+
+        .header {
+            background-color: #413f3b;
+            padding: 0px 0px 0px 0px;
+            height: 100px;
+            position: fixed;
+            top: 0px;
+            width: 100%;
+            z-index: 50;
+        }
+
+        .nav {
+            float: right;
+            font-family: QuicksandBook, Helvetica, Arial, sans-serif;
+            padding: 45px 0px 0px 0px;
+            text-align: right;
+        }
+
+        .wrapper {
+            width: 960px;
+            margin: 0px auto;
+            background-repeat: no-repeat;
+            background-position: 0px 0px;
+            text-align: left;
+        }
+
+        .logo {
+            margin-bottom: 20px;
+        }
+
+        h1,
+        h2 {
+            font-family: QuicksandBook, Helvetica, Arial, sans-serif;
+            font-weight: normal;
+            text-transform: uppercase;
+        }
+
+        h1 {
+            font-size: 240%;
+            margin-top: 140px;
+        }
+
+        .date {
+            font-family: Arial, Helvetica, sans-serif;
+            font-size: 75%;
+            color: #b5c1ad;
+        }
+
+        .intro {
+            clear: left;
+            font-size: 90%;
+            line-height: 1.4em;
+        }
+
+        .main-story {
+            background-image: url("./assets/images/");
+            background-repeat: no-repeat;
+            background-position: 122px 142px;
+            height: 570px;
+        }
+
+        .more-articles {
+            border-top: 1px solid #ffffff;
+            padding: 10px;
+        }
+
+        .more-articles p {
+            border-bottom: 1px solid #807c72;
+            padding: 5px 0px 15px 0px;
+            font-size: 80%;
+        }
+
+        .more-articles p:last-child {
+            border-bottom: none;
+        }
+
+        .footer {
+            clear: both;
+            background: rgba(0, 0, 0, 0.2);
+            padding: 5px 10px;
+        }
+
+        .footer p {
+            font-family: Helvetica, Arial, sans-serif;
+            font-size: 75%;
+            text-align: right;
+        }
+
+        .footer a {
+            color: #807c72;
+        }
+    </style>
+</head>
+
+<body>
+    <div class="header">
+        <div class="container_12">
+            <div class="grid_5">
+                <img src="./assets/images/globe_global_web_internet_international_earth_icon_251300.ico"
+                    alt="Pedal Faster - The modern bicycle magazine" width="50" height="50" class="logo" />
+            </div>
+            <div class="nav grid_7">
+                <a href="">home</a> / <a href="">news</a> / <a href="">archives</a> /
+                <a href="">about</a> / <a href="">contact</a>
+            </div>
+        </div>
+    </div>
+    <div class="wrapper">
+        <div class="main-story">
+            <div class="push_6">
+                <h1><a href="">Fixed Gear Forever</a></h1>
+            </div>
+            <div class="intro grid_3 push_9">
+                <p class="date">16 APRIL 2011</p>
+                <p>The veloheld combines minimalist design with superb quality. Devoid of
+                    excessive graphics and gear shift components, the veloheld product range
+                    delights us with its beauty and simplicity ... </p>
+            </div>
+        </div><!-- .main-story -->
+        <div class="more-articles container_12">
+            <h2 class="grid_12"><a href="">More Articles</a></h2>
+            <div class="grid_3">
+                <img src="./assets/images/depositphotos_35186549-stock-photo-sample-grunge-red-round-stamp.jpg"
+                    alt="The road ahead" width="220" height="125" />
+                <p><a href="">On the Road: from the fixed gear fanatic's point of view</a></p>
+                <p><a href="">Brand History: Pashley Cycles - hand-built in England</a></p>
+                <p><a href="">Frame Wars: Innovations in cycle manufacture and repair</a></p>
+            </div>
+            <div class="grid_3">
+                <img src="./assets/images/depositphotos_35186549-stock-photo-sample-grunge-red-round-stamp.jpg"
+                    alt="Sketchbook" width="220" height="125" />
+                <p><a href="">Touring Diary: A sketchbook in your basket</a></p>
+                <p><a href="">Top Ten Newcomers for 2012: A peek at what's to come</a></p>
+                <p><a href="">InnerTube: The best cycling videos on the web</a></p>
+            </div>
+            <div class="grid_3">
+                <img src="./assets/images/depositphotos_35186549-stock-photo-sample-grunge-red-round-stamp.jpg"
+                    alt="Repair shop sign" width="220" height="125" />
+                <p><a href="">Product Review: All baskets were not created equal</a></p>
+                <p><a href="">Going Public: Out &amp; About with the founder of Public</a></p>
+                <p><a href="">Cycle Lane Defence: Know your rights</a></p>
+            </div>
+            <div class="grid_3">
+                <img src="./assets/images/depositphotos_35186549-stock-photo-sample-grunge-red-round-stamp.jpg"
+                    alt="Schwinn Spitfire" width="220" height="125" />
+                <p><a href="">Bicyle Hall of Fame: The 1958 Schwinn Spitfire</a></p>
+                <p><a href="">Reader Survey: Share your thoughts with us!</a></p>
+                <p><a href="">Chain Gang: The evolution of the humble bike chain</a></p>
+            </div>
+        </div><!-- .more-articles -->
+    </div><!-- .wrapper -->
+    <div class="footer clearfix">
+        <div class="container_12">
+            <p class="grid_12"><a href="">Legal Information</a> | <a href="">Privacy
+                    Policy</a> | <a href="">Copyright &copy; Pedal Faster 2011</a></p>
+        </div>
+    </div>
+</body>
+
+</html>
\ No newline at end of file