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HTML 

              
                <!-- Available in two variations: "light" and "dark" | Change <header> class to see impact. -->
<header class="dark">
  <nav role="navigation">
    <a href="javascript:void(0);" class="ic menu" tabindex="1">
      <span class="line"></span>
      <span class="line"></span>
      <span class="line"></span>
    </a>
    <a href="javascript:void(0);" class="ic close"></a>
    <ul class="main-nav">
      <li class="top-level-link">
        <a><span>Home</span></a>      
      </li> 
      
      <li class="top-level-link">
        <a class="mega-menu"><span>Products</span></a>
        <div class="sub-menu-block">
          <div class="row">
            <div class="col-md-4 col-lg-4 col-sm-4">
              <h2 class="sub-menu-head">Clothing</h2>
              <ul class="sub-menu-lists">
                <li><a>Mens</a></li>
                <li><a>Womens</a></li>
                <li><a>Kids</a></li>
                <li><a>New Born</a></li>
                <li><a>View All</a></li>
              </ul>           
            </div>
            <div class="col-md-4 col-lg-4 col-sm-4">
              <h2 class="sub-menu-head">Handbags</h2>
              <ul class="sub-menu-lists">
                <li><a>Wallets</a></li>
                <li><a>Athletic bag</a></li>
                <li><a>Backpack</a></li>
                <li><a>Bucket Bag</a></li>
                <li><a>View All</a></li>
              </ul>
            </div>
            <div class="col-md-4 col-lg-4 col-sm-4">
              <h2 class="sub-menu-head">Shoes</h2>
              <ul class="sub-menu-lists">
                <li><a>Mens</a></li>
                <li><a>Womens</a></li>
                <li><a>Kids</a></li>
                <li><a>View All</a></li>
              </ul>
            </div>
          </div>
          
          <div class="row banners-area">
            <div class="col-md-3 col-lg-3 col-sm-3">
              <img src="https://resources.ediblearrangements.com/resources/en-us/i/revamp_p/ETGMegaMenu.jpg" width="100%;">
            </div>
            <div class="col-md-3 col-lg-3 col-sm-3">
              <img src="https://resources.ediblearrangements.com/resources/en-us/i/revamp_p/ETGMegaMenu.jpg" width="100%;">
            </div>
            <div class="col-md-3 col-lg-3 col-sm-3">
              <img src="https://resources.ediblearrangements.com/resources/en-us/i/revamp_p/ETGMegaMenu.jpg" width="100%;">
            </div>
            <div class="col-md-3 col-lg-3 col-sm-3">
              <img src="https://resources.ediblearrangements.com/resources/en-us/i/revamp_p/ETGMegaMenu.jpg" width="100%;">
            </div>
          </div>
          
        </div>
      </li>
      <li class="top-level-link">
        <a><span>Services<span></a>    
      </li>
      <li class="top-level-link">
        <a class="mega-menu"><span>About</span></a>
        <div class="sub-menu-block">
          <div class="row">
            <div class="col-md-4 col-lg-4 col-sm-4">
              <h2 class="sub-menu-head">Company</h2>
              <ul class="sub-menu-lists">
                <li><a>About</a></li>
                <li><a>Mission</a></li>
                <li><a>Community</a></li>
                <li><a>Team</a></li>
              </ul>           
            </div>
            <div class="col-md-4 col-lg-4 col-sm-4">
              <h2 class="sub-menu-head">Media</h2>
              <ul class="sub-menu-lists">
                <li><a>News</a></li>
                <li><a>Events</a></li>
                <li><a>Blog</a></li>
              </ul>
            </div>
            <div class="col-md-4 col-lg-4 col-sm-4">
              <h2 class="sub-menu-head">Careers</h2>
              <ul class="sub-menu-lists">
                <li><a>New Opportunities</a></li>
                <li><a>Life @ Company</a></li>
                <li><a>Why Join Us?</a></li>
              </ul>
            </div>
          </div>
          
        </div>
      </li>
      <li class="top-level-link">
        <a><span>Contact</span></a>      
      </li>
    </ul> 
  </nav>
    <blockquote>
      <h2>Responsive Mega Menu - CSS3</h2>
      <br>
      <strong>Cross Browser Support:</strong> <br>
      Tested on Chrome (48.0.2564.109 m), Firefox, IE 11, Chrome Browser for Android 5.1.1 (Xperia Z2), Windows Phone 8.0 for Lumia 720
      <br><br>
      <strong>Expected Support for Desktop:</strong><br>
      IE9+, Chrome, Firefox, Opera, Safari for Mac, <a href="http://caniuse.com/#search=transform" target="_blank">See All Browsers</a>
      <br><br>
      <strong>Expected Support for Handheld:</strong><br>
      Chrome Browser for Android, Android Browser, Safari for iOS, Windows Phone 8.1, <a href="http://caniuse.com/#search=transform" target="_blank">See All Browsers</a>
      <br>
      <hr>
      Available in two variations: "light" and "dark" | Change &lt;header&gt; class to see impact.
    </blockquote>
</header>  
  
<div class="author">
  Created by: <a href="https://www.linkedin.com/in/rathoreahsan/" target="_blank">Ahsan Khurshid</a>
</div>
!

CSS 

              
                /* Body Styles */
body { 
  margin: 0px; 
  padding: 0px; 
  font-family: 'Open Sans', sans-serif; 
  background-color: #fff;  
}


.author {
  position: fixed;
  bottom: 15px;
  right: 15px;
  font-family: 'Open Sans', sans-serif;
  font-size: 14px;
  color: #999;
}

.author a {
  color: #777;
  text-decoration: none;
}

.author a:hover {
  color: blue;
}

header.dark blockquote { color:#fff; }
header.light blockquote { color:#000; }

blockquote { 
  max-width: 1000px; 
  margin:0 auto;
  font-size: 16px; 
  border-left: 0px;
  padding:  20px ;
}

blockquote h2 { padding-right: 40px; margin: 0px; }
header.dark blockquote a {color: orange; text-decoration: underline;}
header.light blockquote a {text-decoration: underline;}
header { min-height: 450px; }
header.dark { background-color: #444; }
header.light { background-color: #fff; }

/* Navigation Styles */
nav { position: relative;  }
header.dark nav { background-color:rgba(255,255,255,0.5); }
header.light nav { background-color:rgba(0,0,0,0.5); }

ul.main-nav { 
  list-style-type: none; 
  padding: 0px;
  font-size: 0px;
  max-width: 1000px;
  margin: 0 auto;
}

ul.main-nav > li { 
  display: inline-block;
  padding: 0; 
}

ul.main-nav > li > a { 
  display: block; 
  padding: 20px 30px; 
  position: relative;
  color: #fff;
  font-size: 16px;
  font-weight: 400;
  box-sizing: border-box;
}

ul.main-nav > li:hover { background-color: #f9f9f9; }
ul.main-nav > li:hover > a { color: #333; font-weight: 400; }

ul.main-nav > li ul.sub-menu-lists {
  margin: 0px;
  padding: 0px;
  list-style-type : none;
  display:block;
}

ul.main-nav > li ul.sub-menu-lists > li {
  padding: 2px 0;
}

ul.main-nav > li ul.sub-menu-lists > li > a {
  font-size: 14px;
}

.ic {
  position: fixed; 
  cursor: pointer;
  display: inline-block;
  right: 25px;
  width: 32px;
  height: 24px;
  text-align: center;
  top:0px;
  outline: none;
}

.ic.close { 
  opacity: 0; 
  font-size: 0px; 
  font-weight: 300; 
  color: #fff;
  top:8px;
  height:40px;
  display: block;
  outline: none;
}

/* Menu Icons for Devices*/
.ic.menu { top:25px; z-index : 20; }

.ic.menu .line { 
  height: 4px; 
  width: 100%; 
  display: block; 
  margin-bottom: 6px; 
}
.ic.menu .line-last-child { margin-bottom: 0px;  }

.sub-menu-head { margin: 10px 0; }
.banners-area { margin-top: 20px; padding-top: 15px; }

.banners-area img {width: 150px;}


@media only screen and (max-width:768px) {
  .sub-menu-head { color:orange; }
  .ic.menu { display: block; }
  header.dark .ic.menu .line { background-color: #fff; } 
  header.light .ic.menu .line { background-color: #000; }
  .ic.menu .line {
    -webkit-transition: all 0.4s ease 0s;
    -o-transition: all 0.4s ease 0s;
    transition: all 0.4s ease 0s;
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    transform: rotate(0deg);
    -webkit-transform-origin: center center;
    -ms-transform-origin: center center;
    transform-origin: center center;
  }
  .ic.menu:focus .line { background-color: #fff !important; }
  
  .ic.menu:focus .line:nth-child(1) { 
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    transform: rotate(45deg); 
  }
  
  .ic.menu:focus .line:nth-child(2){ 
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    transform: rotate(-45deg); 
    margin-top: -10px;
  }
  
  .ic.menu:focus .line:nth-child(3){
    transform: translateY(15px);
    opacity: 0;
  }
  
  .ic.menu:focus{ outline: none; }
  .ic.menu:focus ~ .ic.close { opacity: 1; z-index : 21;  outline: none;  }
  
  /*
  
  .ic.menu:focus ~ .ic.close { opacity: 1.0; z-index : 21;  }
  .ic.close:focus { opacity: 0; }
  */
  .ic.menu:hover, 
  .ic.menu:focus{ opacity: 1; }
  

  nav { background-color: transparent; }
  
 /* Main Menu for Handheld Devices  */
  ul.main-nav {
    z-index:2; 
    padding: 50px 0;
    position: fixed;
    right: 0px;
    top: 0px;
    width: 0px;
    background-color:rgba(0,0,0,1);
    height: 100%;
    overflow: auto;
    /*CSS animation applied : Slide from Right*/
   -webkit-transition-property: background, width;
    -moz-transition-property: background, width;
    -o-transition-property: background, width;
    transition-property: background, width;
   	-webkit-transition-duration: 0.6s;
	  -moz-transition-duration: 0.6s;
	  -o-transition-duration: 0.6s;
    transition-duration: 0.6s;
  }
  
  .ic.menu:focus ~ .main-nav { width: 300px; background-color:rgba(0,0,0,1); }
  
  ul.main-nav > * { 
    -webkit-transition-property: opacity;
    -moz-transition-property: opacity;
    -o-transition-property: opacity;
    transition-property: opacity;
   	-webkit-transition-duration: 0.4s;
	  -moz-transition-duration: 0.4s;
	  -o-transition-duration: 0.4s;
    transition-duration: 0.4s;
    opacity: 0;
  }
  .ic.menu:focus ~ .main-nav > * {opacity: 1;}
  
  ul.main-nav > li > a:after {display: none;}
  ul.main-nav > li:first-child { border-radius: 0px; }
  ul.main-nav > li {
    display: block;
    border-bottom: 1px solid #444;
  }
  
  ul.main-nav > li > a { font-weight: 600; }
  
  ul.main-nav > li ul.sub-menu-lists > li a { color: #eee; font-size: 14px; }
  .sub-menu-head { font-size: 16px;}
  ul.main-nav > li:hover { background-color: transparent;  }
  ul.main-nav > li:hover > a {color: #fff; text-decoration: none; font-weight: 600;}
 .ic.menu:focus ~ ul.main-nav > li > div.sub-menu-block {
    border-left: 0px solid #ccc;
    border-right: 0px solid #ccc;
    border-bottom: 0px solid #ccc;
    position: relative;
    visibility: visible;
    opacity: 1.0;
  }
  
  .sub-menu-block { padding: 0 30px; }
  .banners-area { padding-bottom: 0px;  }
  .banners-area div { margin-bottom: 15px;  }
  .banners-area { border-top: 1px solid #444; }
}

@media only screen and (min-width:769px) {
  .ic.menu { display: none; }
  /* Main Menu for Desktop Devices  */
  ul.main-nav { display: block; position: relative; }
  .sub-menu-block { padding: 15px; }
  
  /* Sub Menu */
  ul.main-nav > li > div.sub-menu-block { 
  visibility: hidden;
  background-color: #f9f9f9;
  position: absolute;
  margin-top: 0px;
  width: 100%;
  color: #333;
  left: 0;
  box-sizing: border-box;
  z-index : 3;
  font-size: 16px;
  border-left: 1px solid #ccc;
  border-right: 1px solid #ccc;
  border-bottom: 1px solid #ccc;
  opacity: 0;
    
  /*CSS animation applied for sub menu : Slide from Top */
  -webkit-transition: all 0.4s ease 0s;
  -o-transition: all 0.4s ease 0s;
  transition: all 0.4s ease 0s;
  -webkit-transform: rotateX(90deg);
  -moz-transform: rotateX(90deg);
  -ms-transform: rotateX(90deg);
  transform: rotateX(90deg);
  -webkit-transform-origin: top center;
  -ms-transform-origin: top center;
  transform-origin: top center;
  
  }
  
  ul.main-nav > li:hover > div.sub-menu-block{ 
    background-color: #f9f9f9; 
    visibility: visible;
    opacity: 1;
    -webkit-transform: rotateX(0deg);
    -moz-transform: rotateX(0deg);
    -ms-transform: rotateX(0deg);
    transform: rotateX(0deg);
  }
  
  ul.main-nav > li > div.sub-menu-block > * {
    -webkit-transition-property: opacity;
    -moz-transition-property: opacity;
    -o-transition-property: opacity;
    transition-property: opacity;
   	-webkit-transition-duration: 0.4s;
	  -moz-transition-duration: 0.4s;
	  -o-transition-duration: 0.4s;
    transition-duration: 0.4s;
    opacity: 0;
  }
  
  ul.main-nav > li:hover > div.sub-menu-block > * {
    opacity: 1;
  }
  
  .sub-menu-head { font-size: 20px;}
  
  /* List Separator: Outer Border */
  header.dark ul.main-nav > li > a { border-right: 1px solid #bbb; }
  header.light ul.main-nav > li > a { border-right: 1px solid #666; }
  
  /* List Separator: Inner Border */
  ul.main-nav > li > a:after {
    content: '';
    width: 1px;
    height: 62px;
    position: absolute;
    right:0px;
    top: 0px;
    z-index : 2;
  }
  header.dark ul.main-nav > li > a:after { background-color: #777; }
  header.light ul.main-nav > li > a:after { background-color: #999; }
  
  /* Drop Down/Up Arrow for Mega Menu */
  ul.main-nav > li > a.mega-menu > span { display: block; vertical-align: middle; }
  ul.main-nav > li > a.mega-menu > span:after {
    width: 0; 
    height: 0; 
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid #fff;
    content: '';
    background-color: transparent;
    display: inline-block;
    margin-left: 10px;
    vertical-align: middle;
  }

  ul.main-nav > li:hover > a.mega-menu span:after{
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 0px solid transparent;
    border-bottom: 5px solid #666;
  }
  .banners-area { border-top: 1px solid #ccc; }
}
!

JS
!
999px

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