Johnny Johnny - 4 months ago 12x
CSS Question

How to make that responsive hamburger menu work? It just doesnt

Can you tell me why that hamburger menu doesn't open?

  • all the files are in one folder as you can see here:
    enter image description here

  • jQuery is included on first position

  • using Chromes newest version

But still it doesn't work ;( If I copy the code on jsfiddle everything works, so I think there is a problem the the connection HTML/JS? Also the funny thing is that if I try out some other different navigation from codepen, it also doesnt open.


<!DOCTYPE html>
<meta charset="UTF-8">

<link rel="stylesheet" type="text/css" href="style.css">

<script src=""></script>
<script type="text/javascript" src="script.js"></script>

<a href="#" class="hamburger">
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
<ul class="clearfix menu">
<li><a href="#">Home</a></li>
<li><a href="#">Service</a></li>
<li><a href="#">Contact</a></li>
<li><a href="#">Blog</a></li>
<li><a href="#">About</a></li>


@import url(',700');

*, *:before, *:after {
margin: 0;
padding: 0;
box-sizing: border-box;

.clearfix:after {
content: "";
display: table;
clear: both;

html, body {
height: 100%;

body {
font: 1em 'Roboto', sans-serif;
color: #555;
background-color: #fff;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;

ul {
list-style: none;
max-width: 800px;
margin: 0 auto;
border-left: 1px solid #ddd;
border-right: 1px solid #ddd;

h1 {
padding: 30px 0;
font: 1.5em 'Open Sans', sans-serif;
text-align: center;

nav {
border-top: 1px solid #ddd;
border-bottom: 1px solid #ddd;
background-color: #f5f5f5;

ul a {
display: block;
padding: 20px;
padding-right: 0 !important; /* important overrides media queries */
font-size: 13px;
font-weight: bold;
text-align: center;
color: #aaa;
cursor: pointer;
text-decoration: none;

ul a:hover {
background: #eee;

nav li {
float: left;
width: 20%;
border-right: 1px solid #ddd;

nav li:last-child {
border-right: none;

@media only screen and (max-width: 480px) {

.hamburger {
padding: 15px;
display: block;

.line {
border-bottom: 4px solid #bbb;
width: 35px;
margin-bottom: 6px;

.line:last-child {
margin-bottom: 0;

nav li {
width: 100%;

.menu {
height: 0;
overflow: hidden;
transition: height 0.3s linear;

.slide-down {
height: 262px;


$('.hamburger').on('click', function(e) {


Make sure you run the javascript code only when the document is ready-

$( document ).ready(function() {
    $('.hamburger').on('click', function(e) {