Mega
 menu's are being used extensively these days and are really useful for 
displaying a huge amount of content without cluttering your layout.  The
 real credit for this menu goes to Guillaume Marty I have just fixed 
some CSS related conflicts that were happening due to the default 
Stylesheet that is Enjoy

How to do this method to your blog just follow this instruction
1. First go to you blog and locate this options "Dashboard > Layout > Add a Gadget" Then click on the Add a Gadget
2. Now Click on "HTML/Javascript" and copy the below whole code and paste it there inside empty box
3. Now Replace the all highlight color with your own Link, Title and Text
How to do this method to your blog just follow this instruction
1. First go to you blog and locate this options "Dashboard > Layout > Add a Gadget" Then click on the Add a Gadget
2. Now Click on "HTML/Javascript" and copy the below whole code and paste it there inside empty box
<div id="menu">
<li><a href="#" class="drop">Home</a><!-- Begin Home Item -->
<div class="dropdown_2columns"><!-- Begin 2 columns container -->
<div class="col_2">
<h2>Welcome !</h2>
</div>
<div class="col_2">
<p>This is a Mega Drop Down Menu</p>           
<p>This
 item comes with a large range of prepared typographic stylings such as 
headings, lists, etc. for your blogger</p>           
</div>
<div class="col_2">
<h2>Browser Support</h2>
</div>
<div class="col_1">
<img
 
src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmJzFOVU5y80Oam7dG-H180yoSHm0m_Zxt0Yi7Qpp0-8CxRU1EuIELidJPUj7lNaIjUW9XAWdW0WV5wzblEK-IVNXUR0QmJGyvmhDw5ByRDYvZCdiRuy1RQvOAUTGOtjfmke_ZpI1ZvUuC/w125-h48-no/browser.png"
 width="125" height="48" alt="" />
</div>
<div class="col_1">
<p>This mega menu has been tested in all major browsers it is 100% working</p>
</div>
</div><!-- End 2 columns container -->
</li><!-- End Home Item -->
<li><a href="#" class="drop">Windows tips</a><!-- Begin 5 columns Item -->
<div class="dropdown_5columns"><!-- Begin 5 columns container -->
<div class="col_5">
<h2>This is an example of a large container with 5 columns</h2>
</div>
<div class="col_1">
<p
 class="black_box">This is a dark grey box text. Fusce in metus at 
enim porta lacinia vitae a arcu. Sed sed lacus nulla mollis porta 
quis.</p>
</div>
<div class="col_1">
<p>Phasellus
 vitae sapien ac leo mollis porta quis sit amet nisi. Mauris hendrerit, 
metus cursus accumsan tincidunt.</p>
</div>
<div class="col_1">
<p
 class="italic">This is a sample of an italic text. Consequat 
scelerisque. Fusce sed lectus at arcu mollis accumsan at nec nisi porta 
quis sit amet.</p>
</div>
<div class="col_1">
<p>Curabitur
 euismod gravida ante nec commodo. Nunc dolor nulla, semper in ultricies
 vitae, vulputate porttitor neque.</p>
</div>
<div class="col_1">
<p
 class="strong">This is a sample of a bold text. Aliquam sodales nisi
 nec felis hendrerit ac eleifend lectus feugiat scelerisque.</p>
</div>
<div class="col_5">
<h2>Here is some content with side images</h2>
</div>
<div class="col_3">
<img
 
src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXPKoZYNaNt2gl4wzXlD5FErzQIzqdFU61zuEHrEdXvFyjZMzTNGJh3iedtFqZr3TB5wLvH3mMge8_6LBQ0xsceo_NqgnhFmD3ssIAY1lvbtekJ74-RfTDLe0J9qYQAyzkZMG4pqTav425/s70-no/"
 width="70" height="70" class="img_left imgshadow" alt="" />
<p>Maecenas
 eget eros lorem, nec pellentesque lacus. Aenean dui orci, rhoncus sit 
amet tristique eu, tristique sed odio. Praesent ut interdum elit. Sed in
 sem mauris. Aenean a commodo mi. Praesent augue lacus.<a href="#">Read more...</a></p>
<img
 
src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8gRREPnGMDaLn1Y8gDu-28NYNndmD8tM7f7-taMGBIjI743b_ivmOOu5zTCHs1N3-eh3UwPkWag_ws_azO2x57igvi0S0qMASAvptirME8xDvc7wdzJXv7mFb55HabFyHJVim4FFL2Imp/s70-no/02+%25281%2529.jpg"
 width="70" height="70" class="img_left imgshadow" alt="" />
<p>Aliquam
 elementum felis quis felis consequat scelerisque. Fusce sed lectus at 
arcu mollis accumsan at nec nisi. Aliquam pretium mollis fringilla. Nunc
 in leo urna, eget varius metus. Aliquam sodales nisi.<a href="#">Read more...</a></p>
</div>
<div class="col_2">
<p
 class="black_box">This is a black box, you can use it to highligh 
some content. Sed sed lacus nulla, et lacinia risus. Phasellus vitae 
sapien ac leo mollis porta quis sit amet nisi. Mauris hendrerit, metus 
cursus accumsan tincidunt.Quisque vestibulum nisi non nunc blandit 
placerat. Mauris facilisis, risus ut lobortis posuere, diam lacus congue
 lorem, ut condimentum ligula est vel orci. Donec interdum lacus at 
velit varius gravida. Nulla ipsum risus.</p>
</div>
</div><!-- End 5 columns container -->
</li><!-- End 5 columns Item -->
<li><a href="#" class="drop">Internet Tips</a><!-- Begin 4 columns Item -->
<div class="dropdown_4columns"><!-- Begin 4 columns container -->
<div class="col_4">
<h2>This is a heading title</h2>
</div>
<div class="col_1">
<h3>Some Links</h3>
<ul>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
</ul> 
</div>
<div class="col_1">
<h3>Useful Links</h3>
<ul>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
</ul> 
</div>
<div class="col_1">
<h3>Other Stuff</h3>
<ul>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
</ul> 
</div>
<div class="col_1">
<h3>Misc</h3>
<ul>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">More...</a></li>
</ul> 
</div>
</div><!-- End 4 columns container -->
</li><!-- End 4 columns Item -->
<li class="menu_right"><a href="#" class="drop">Graphic Design</a>
<div class="dropdown_1column align_right">
<div class="col_1">
<ul class="simple">
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">More...</a></li>
</ul> 
</div>
</div>
</li>
<li class="menu_right"><a href="#" class="drop">Earn Money Online</a><!-- Begin 3 columns Item -->
<div class="dropdown_3columns align_right"><!-- Begin 3 columns container -->
<div class="col_3">
<h2>Lists in Boxes</h2>
</div>
<div class="col_1">
<ul class="greybox">
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
</ul> 
</div>
<div class="col_1">
<ul class="greybox">
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
</ul> 
</div>
<div class="col_1">
<ul class="greybox">
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">Online Guru</a></li>
<li><a href="#">More...</a></li>
</ul> 
</div>
<div class="col_3">
<h2>Here are some image examples</h2>
</div>
<div class="col_3">
<img
 
src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8gRREPnGMDaLn1Y8gDu-28NYNndmD8tM7f7-taMGBIjI743b_ivmOOu5zTCHs1N3-eh3UwPkWag_ws_azO2x57igvi0S0qMASAvptirME8xDvc7wdzJXv7mFb55HabFyHJVim4FFL2Imp/s70-no/02+%25281%2529.jpg"
 width="70" height="70" class="img_left imgshadow" alt="" />
<p>Maecenas
 eget eros lorem, nec pellentesque lacus. Aenean dui orci, rhoncus sit 
amet tristique eu, tristique sed odio. Praesent ut interdum elit. 
Maecenas imperdiet, nibh vitae rutrum vulputate, lorem sem 
condimentum.<a href="#">Read more...</a></p>
<img
 
src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXPKoZYNaNt2gl4wzXlD5FErzQIzqdFU61zuEHrEdXvFyjZMzTNGJh3iedtFqZr3TB5wLvH3mMge8_6LBQ0xsceo_NqgnhFmD3ssIAY1lvbtekJ74-RfTDLe0J9qYQAyzkZMG4pqTav425/s70-no/"
 width="70" height="70" class="img_left imgshadow" alt="" />
<p>Aliquam
 elementum felis quis felis consequat scelerisque. Fusce sed lectus at 
arcu mollis accumsan at nec nisi. Aliquam pretium mollis fringilla. 
Vestibulum tempor facilisis malesuada. <a href="#">Read more...</a></p>
</div>
</div><!-- End 3 columns container -->
</li><!-- End 3 columns Item -->
</div>
<style type="text/css">
body, ul, li {
 font-size:14px;
 font-family:Arial, Helvetica, sans-serif;
 line-height:21px;
 text-align:left;
}
/* Navigation Bar */
#menu {
 list-style:none;
 width:940px;
 margin:30px auto 0px auto;
 height:43px;
 padding:0px 20px 0px 20px;
 /* Rounded Corners */
 -moz-border-radius: 10px;
 -webkit-border-radius: 10px;
 border-radius: 10px;
 /* Background color and gradients */
 background: #014464;
 background: -moz-linear-gradient(top, #0272a7, #013953);
 background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#0272a7), to(#013953));
199
 /* Borders */
 border: 1px solid #002232;
 -moz-box-shadow:inset 0px 0px 1px #edf9ff;
 -webkit-box-shadow:inset 0px 0px 1px #edf9ff;
 box-shadow:inset 0px 0px 1px #edf9ff;
}
#menu li {
 float:left;
 text-align:center;
 position:relative;
 padding: 4px 10px 4px 10px;
 margin-right:30px;
 margin-top:7px;
 border:none;
}
#menu li:hover {
 border: 1px solid #777777;
 padding: 4px 9px 4px 9px;
 /* Background color and gradients */
 background: #F4F4F4;
 background: -moz-linear-gradient(top, #F4F4F4, #EEEEEE);
 background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#F4F4F4), to(#EEEEEE));
 /* Rounded corners */
 -moz-border-radius: 5px 5px 0px 0px;
 -webkit-border-radius: 5px 5px 0px 0px;
 border-radius: 5px 5px 0px 0px;
}
#menu li a {
 font-family:Arial, Helvetica, sans-serif;
 font-size:14px;
 color: #EEEEEE;
 display:block;
 outline:0;
 text-decoration:none;
 text-shadow: 1px 1px 1px #000;
}
#menu li:hover a {
 color:#161616;
 text-shadow: 1px 1px 1px #FFFFFF;
}
#menu li .drop {
 padding-right:21px;
 background:url("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTDrD2sYpQZBwD3gmuWyO7G4exaxf9BR6vSf9MsKPyXY47cY8KZjykxLrGlJlbFLo-rgy4Iwef7iKufEBRTI4FTCxjz0QCNXb1hoYDAwYlOHUxNVduqw85zQ5_glJ_iPkpc81PW2HvKk1I/s1600/drop.png") no-repeat right 8px;
}
#menu li:hover .drop {
 background:url("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTDrD2sYpQZBwD3gmuWyO7G4exaxf9BR6vSf9MsKPyXY47cY8KZjykxLrGlJlbFLo-rgy4Iwef7iKufEBRTI4FTCxjz0QCNXb1hoYDAwYlOHUxNVduqw85zQ5_glJ_iPkpc81PW2HvKk1I/s1600/drop.png") no-repeat right 7px;
}
/* Drop Down */
.dropdown_1column,
.dropdown_2columns,
.dropdown_3columns,
.dropdown_4columns,
.dropdown_5columns {
 margin:4px auto;
 float:left;
 position:absolute !important;
 left:-999em; /* Hides the drop down */
 text-align:left;
 padding:10px 5px 10px 5px;
 border:1px solid #777777;
 border-top:none;
 /* Gradient background */
 background:#F4F4F4;
 background: -moz-linear-gradient(top, #EEEEEE, #BBBBBB);
 background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#EEEEEE), to(#BBBBBB));
 /* Rounded Corners */
 -moz-border-radius: 0px 5px 5px 5px;
 -webkit-border-radius: 0px 5px 5px 5px;
 border-radius: 0px 5px 5px 5px;
}
.dropdown_1column {width: 140px;}
.dropdown_2columns {width: 280px;}
.dropdown_3columns {width: 420px;}
.dropdown_4columns {width: 560px;}
.dropdown_5columns {width: 700px;}
#menu li:hover .dropdown_1column,
#menu li:hover .dropdown_2columns,
#menu li:hover .dropdown_3columns,
#menu li:hover .dropdown_4columns,
#menu li:hover .dropdown_5columns {
 left:-1px ;
z-index:444 !important;
    top:auto;
}
/* Columns */
.col_1,
.col_2,
.col_3,
.col_4,
.col_5 {
 display:inline;
 float: left;
 position: relative;
 margin-left: 5px;
 margin-right: 5px;
}
.col_1 {width:130px;}
.col_2 {width:270px;}
.col_3 {width:410px;}
.col_4 {width:550px;}
.col_5 {width:690px;}
/* Right alignment */
#menu .menu_right {
 float:right !important;
 margin-right:0px;
}
#menu li .align_right {
 /* Rounded Corners */
 -moz-border-radius: 5px 0px 5px 5px;
    -webkit-border-radius: 5px 0px 5px 5px;
    border-radius: 5px 0px 5px 5px;
}
#menu li:hover .align_right {
 left:auto;
 right:-1px;
 top:auto;
}
/* Drop Down Content Stylings */
#menu p, #menu h2, #menu h3, #menu div li {
 font-family:Arial, Helvetica, sans-serif;
 line-height:21px;
 font-size:12px;
 text-align:left;
 text-shadow: 1px 1px 1px #FFFFFF;
}
#menu h2 {
 font-size:21px;
 font-weight:400;
 letter-spacing:-1px;
 margin:7px 0 14px 0;
 padding-bottom:14px;
 border-bottom:1px solid #666666;
}
#menu h3 {
 font-size:14px;
 margin:7px 0 14px 0;
 padding-bottom:7px;
 border-bottom:1px solid #888888;
}
#menu p {
 line-height:18px;
 margin:0 0 10px 0;
}
#menu li:hover div a {
 font-size:12px;
 color:#015b86;
}
#menu li:hover div a:hover {
 color:#029feb;
}
.strong {
 font-weight:bold;
}
.italic {
 font-style:italic;
}
.imgshadow {
 background:#FFFFFF;
 padding:4px;
 border:1px solid #777777;
 margin-top:5px;
 -moz-box-shadow:0px 0px 5px #666666;
 -webkit-box-shadow:0px 0px 5px #666666;
 box-shadow:0px 0px 5px #666666;
}
.img_left { /* Image sticks to the left */
 width:auto;
 float:left;
 margin:5px 15px 5px 5px;
}
#menu li .black_box {
 background-color:#333333;
 color: #eeeeee;
 text-shadow: 1px 1px 1px #000;
 padding:4px 6px 4px 6px;
 /* Rounded Corners */
 -moz-border-radius: 5px;
 -webkit-border-radius: 5px;
 border-radius: 5px;
 /* Shadow */
 -webkit-box-shadow:inset 0 0 3px #000000;
 -moz-box-shadow:inset 0 0 3px #000000;
 box-shadow:inset 0 0 3px #000000;
}
#menu li ul {
 list-style:none;
 padding:0;
 margin:0 0 12px 0;
}
#menu li ul li {
 font-size:12px;
 line-height:24px;
 position:relative;
 text-shadow: 1px 1px 1px #ffffff;
 padding:0;
 margin:0;
 float:none
 text-align:left;
 width:130px;
}
#menu li ul li:hover {
 background:none;
 border:none;
 padding:0;
 margin:0;
}
#menu li .greybox li {
 background:#F4F4F4;
 border:1px solid #bbbbbb;
 margin:0px 0px 4px 0px;
 padding:4px 6px 4px 6px;
 width:116px;
 /* Rounded Corners */
 -moz-border-radius: 5px;
 -webkit-border-radius: 5px;
 border-radius: 5px;
}
#menu li .greybox li:hover {
 background:#ffffff;
 border:1px solid #aaaaaa;
 padding:4px 6px 4px 6px;
 margin:0px 0px 4px 0px;
}
.tabs-inner .widget li a {
padding: 1px ;
display:block !important;
border: 1px solid  transparent !important ;
}
</style>
3. Now Replace the all highlight color with your own Link, Title and Text
4. after finished finally save the gadget you are Done!




