Responsive Menubar

HTML

<nav id='pmflatnav'>
<ul><li><a href="http://aemquickstart.blogspot.in/">Home</a></li>
  <li><a href="#">2015 Posts</a>
    <ul>
      <li><a href="#">Nov Posts</a></li>
      <li><a href="#">AEM</a></li>
    </ul>
  </li>
  <li><a href="#">AEM Important URLs</a>
  <ul>
      <li><a href="#">Nov Posts</a></li>
      <li><a href="#">AEM</a></li>
    </ul></li>
  <li><a href="http://aemquickstart.blogspot.in/p/sitemap_13.html">Sitemap</a></li>
  <li><a href="http://tricks-nd-tweaks.blogspot.in/">Others</a>
	  <ul>
		  <li><a href="http://tricks-nd-tweaks.blogspot.in/">Tricks and Tweaks</a></li>		  
		</ul>
	  </li>
  
</ul>
</nav>
<div id='nav-trigger'>
    <span>Menu <i class='fa fa-list'></i></span>
</div>
<nav id='nav-mobile'></nav>
Note: Don't forget to change the names of the menu to what you want and also replace the # within link tag with your links.

CSS

#nav-trigger {
    display: none;
    text-align: center;
}
#nav-trigger span {
    display: block;
    background-color: #5b97f9;
    cursor: pointer;
    text-transform: uppercase;
    padding: 0 25px;
    color: white;
    font-weight:bold;
    line-height: 67px;
}
nav#nav-mobile {
    margin: 0px;
}
#pmflatnav a {color:#ecf0f1;}
#pmflatnav ul {
  text-align: left;
  display: inline;
  margin: 0;
  padding: 15px 4px 17px 0;
  list-style: none;
  -webkit-box-shadow: 0 0 5px rgba(0, 0, 0, 0.15);
  -moz-box-shadow: 0 0 5px rgba(0, 0, 0, 0.15);
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.15);
}
#pmflatnav ul li {

  font: bold 12px/18px sans-serif;
    border-top:2px solid;
    border-right:1px dotted;
  display: inline-block;
  margin-right: -4px;
  position: relative;
  padding: 15px 20px;
  background: #5b97f9;
  cursor: pointer;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
}
#pmflatnav ul li:hover {
  background: #34495e;
  color: #fff;
}
#pmflatnav ul li ul {
  padding: 0;
  position: absolute;
  top: 48px;
  left: 0;
  width: 150px;
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
  display: none;
  opacity: 0;
  visibility: hidden;
  -webkit-transiton: opacity 0.2s;
  -moz-transition: opacity 0.2s;
  -ms-transition: opacity 0.2s;
  -o-transition: opacity 0.2s;
  -transition: opacity 0.2s;
}
#pmflatnav ul li ul li {
  background: #5b97f9;
  display: block;
  color: black;

}
#pmflatnav ul li ul li:hover { background: #34495e; }
#pmflatnav ul li:hover ul {
  display: block;
  opacity: 1;
  visibility: visible;
}
nav#nav-mobile {
    position: relative;
    display: none;
}
nav#nav-mobile ul {
    display: none;
    list-style-type: none;
    position: absolute;
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    background-color: #ddf0f9;
    z-index: 10;
    padding: 0px;
    border-bottom: solid...

JavaScript

//<![CDATA[
$(document).ready(function(){
    $("#nav-mobile").html($("#pmflatnav").html());
    $("#nav-trigger span").click(function(){
        if ($("nav#nav-mobile ul").hasClass("expanded")) {
            $("nav#nav-mobile ul.expanded").removeClass("expanded").slideUp(250);
            $(this).removeClass("open");
        } else {
            $("nav#nav-mobile ul").addClass("expanded").slideDown(250);
            $(this).addClass("open");
        }
    });
});
//]]>