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diff --git a/resp.html b/resp.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<style>
+body {margin: 0;}
+
+ul.sidenav {
+  list-style-type: none;
+  margin: 0;
+  padding: 0;
+  width: 25%;
+  background-color: #f1f1f1;
+  position: fixed;
+  height: 100%;
+  overflow: auto;
+}
+
+ul.sidenav li a {
+  display: block;
+  color: #000;
+  padding: 8px 16px;
+  text-decoration: none;
+}
+ 
+ul.sidenav li a.active {
+  background-color: #4CAF50;
+  color: white;
+}
+
+ul.sidenav li a:hover:not(.active) {
+  background-color: #555;
+  color: white;
+}
+
+div.content {
+  margin-left: 25%;
+  padding: 1px 16px;
+  height: 1000px;
+}
+
+@media screen and (max-width: 900px) {
+  ul.sidenav {
+    width: 100%;
+    height: auto;
+    position: relative;
+  }
+  
+  ul.sidenav li a {
+    float: left;
+    padding: 15px;
+  }
+  
+  div.content {margin-left: 0;}
+}
+
+@media screen and (max-width: 400px) {
+  ul.sidenav li a {
+    text-align: center;
+    float: none;
+  }
+}
+</style>
+</head>
+<body>
+
+<ul class="sidenav">
+  <li><a class="active" href="#home">Home</a></li>
+  <li><a href="#news">News</a></li>
+  <li><a href="#contact">Contact</a></li>
+  <li><a href="#about">About</a></li>
+</ul>
+
+<div class="content">
+  <h2>Responsive Sidenav Example</h2>
+  <p>This example use media queries to transform the sidenav to a top navigation bar when the screen size is 900px or less.</p>
+  <p>We have also added a media query for screens that are 400px or less, which will vertically stack and center the navigation links.</p>
+  <p>You will learn more about media queries and responsive web design later in our CSS Tutorial.</p>
+  <h3>Resize the browser window to see the effect.</h3>
+</div>
+
+</body>
+</html>
+
+
