Responsive Slide Down Menu with jQuery and CSS3

A jQuery & CSS3 based responsive, mobile-friendly menu that slides out from the top of the web page when you click the menu tab. Also comes with a full page overlay covering the main content to focus your users on the menu items.

How to use it:

1. Create a navigation menu using Html unordered list.

<nav id="menu">
  <ul>
    <li><a href="#">menu1</a></li>
    <li><a href="#">menu2</a></li>
    <li><a href="#">menu3</a></li>
    <li><a href="#">menu4</a></li>
    <li><a href="#">menu5</a></li>
  </ul>
</nav>

2. Create a button to toggle the navigation menu.

<div id="btn"><span></span></div>

3. Wrap the navigation menu and the toggle button into a container. The whole thing would be like this:

<div class="slide_container"> 
  
  <nav id="menu">
    <ul>
      <li><a href="#">menu1</a></li>
      <li><a href="#">menu2</a></li>
      <li><a href="#">menu3</a></li>
      <li><a href="#">menu4</a></li>
      <li><a href="#">menu5</a></li>
    </ul>
  </nav>

  <div id="btn"><span></span></div>
  
</div>

3. The CSS to make the menu sticky at the top of the web page.

.slide_container {
  width: 100%;
  position: absolute;
  top: 0;
  z-index: 999;
}

4. The CSS to style the navigation menu and the toggle button.

#menu {
  padding: 50px 0;
  border-bottom: solid 10px #ff725d;
  background: #fff;
  display: none;
}

#menu ul {
  overflow: hidden;
  margin: 0 auto;
  padding: 0;
  max-width: 800px;
  width: 100%;
}

#menu li {
  float: left;
  padding: 0;
  width: 20%;
  list-style: none;
}

#menu li a {
  display: block;
  margin: 0 5%;
  padding: 20px 0;
  border: solid 1px #333;
  background: #fff;
  color: #666;
  text-align: center;
  text-decoration: none;
  font-size: 18px;
}

#menu li a:hover {
  border: solid 1px #12a1c6;
  color: #12a1c6;
}

#menu li a:active {
  border: solid 1px #0e7b97;
  color: #0e7b97;
}

#btn {
  margin: 0 auto;
  width: 200px;
  height: 30px;
  border-radius: 0 0 5px 5px;
  background: #ff725d;
  cursor: pointer;
}

#btn span {
  position: relative;
  top: 12px;
  left: 50%;
  display: block;
  margin-left: -25px;
  width: 50px;
  height: 5px;
  border-radius: 5px;
  background: #fff;
  box-shadow: inset 1px 1px 2px #ddd;
}

5. The CSS to create the fullpage overlay.

.layer {
  position: fixed;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: #ff725d;
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(opacity=50)";
  opacity: 0.5;
}

6. Make the navigation menu responsive using CSS3 media queries.

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

#menu { padding: 5%; }

#menu li { width: 100%; }

#menu li a { border-top: none; }

#menu li a:hover { margin-top: -1px; }

#menu li:first-child a { border-top: solid 1px #333; }

#menu li:first-child a:hover {
  margin-top: 0;
  border-top: solid 1px #12a1c6;
}
}

7. Include the necessary jQuery library at the bottom of the web page.

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> 

8. Enable the slide down menu with a little javascript.

$(function() {
  var openBtn = $('#btn'),
  slideMenu = $('#menu'), 
  layer = $('<div />').addClass('layer');
  openBtn.on("click", function() {
    if (slideMenu.is(':hidden')) {
      slideMenu.slideDown(300); 
    } else {
      slideMenu.slideUp(300);
      layer.remove();
    }
    });
});

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This awesome jQuery plugin is developed by mp_graphic. For more Advanced Usages, please check the demo page or visit the official website.