Create Horizontal Navigation Menu With Drop Down Submenus Using CSS

The following drop down menu is made only with CSS, is a horizontal menu with sub-tabs and the right side has a rounded search. A menu is handy for those who do not require complex menus or prefer not to use one that requires scripts and/or too many images, also the installation and customization is quite simple, and to top it off is quite functional.
To see this drop down menu in action, visit this demo blog

Prior to doing anything, if you are using a Template made through Blogger Template Designer, then you should consider doing these changes in the template, otherwise the menu might not be displayed correctly:

From your Blogger's Dashboard, go to Template (make a backup < see the screenshot) > Edit HTML:

and search (CTRL + F) for the following line:

<b:section class='tabs' id='crosscol' maxwidgets='1' showaddelement='yes'>

Screenshot

Remove the code in red.
You may have many parts as the one in red, delete all you find.

....then find this section in your template:

/* Tabs
----------------------------------------------- */

...and remove all that is within it, until you reach to the Headings part.

/* Tabs
----------------------------------------------- */
.tabs-outer {
overflow: hidden;
position: relative;
background: $(tabs.background.color) $(tabs.background.gradient) repeat scroll 0 0;
}

#layout .tabs-outer {
overflow: visible;
}

.tabs-cap-top, .tabs-cap-bottom {
position: absolute;
width: 100%;

border-top: 1px solid $(tabs.border.color);

}

.tabs-cap-bottom {
bottom: 0;
}

.tabs-inner .widget li a {
display: inline-block;

margin: 0;
padding: .6em 1.5em;

font: $(tabs.font);
color: $(tabs.text.color);

border-top: 1px solid $(tabs.border.color);
border-bottom: 1px solid $(tabs.border.color);
border-$startSide: 1px solid $(tabs.border.color);
}

.tabs-inner .widget li:last-child a {
border-$endSide: 1px solid $(tabs.border.color);
}

.tabs-inner .widget li.selected a, .tabs-inner .widget li a:hover {
background: $(tabs.selected.background.color) $(tabs.background.gradient) repeat-x scroll 0 -100px;
color: $(tabs.selected.text.color);
}
/* Headings
----------------------------------------------- */

Then add this to where the code has been removed (instead of the code in green):

#crosscol ul {z-index: 200; padding:0 !important;}
#crosscol li:hover {position:relative;}
#crosscol ul li {padding:0 !important;}
.tabs-outer {z-index:1;}
.tabs .widget ul, .tabs .widget ul {overflow: visible;}

Having done this, we can finally add our menu.

How To Add Horizontal Drop Down Menu to Blogger

To put this horizontal menu with submenus in your blog, then follow the next steps:

Step 1. From Template, go to Edit HTML and just above ]]></b:skin> paste these styles:

/* Horizontal drop down menu
----------------------------------------------- */
#menuWrapper {
width:100%; /* Menu width */
height:35px;
padding-left:14px;
background:#333; /* Background color */
border-radius: 10px;
}
.menu {
padding:0;
margin:0;
list-style:none;
height:35px;
position:relative;
z-index:5;
font-family:arial, verdana, sans-serif;
}
.menu li:hover li a {
background:none;
}
.menu li.top {display:block; float:left;}
.menu li a.top_link {
display:block;
float:left;
height:35px;
line-height:34px;
color:#ccc;
text-decoration:none;
font-family:"Verdana", sans-serif;
font-size:12px; /* Font size */
font-weight:bold;
padding:0 0 0 12px;
cursor:pointer;
}
.menu li a.top_link span {
float:left;
display:block;
padding:0 24px 0 12px;
height:35px;
}
.menu li a.top_link span.down {
float:left;
display:block;
padding:0 24px 0 12px;
height:35px;
}
.menu li a.top_link:hover, .menu li:hover > a.top_link {color:#fff; }
.menu li:hover {position:relative; z-index:2;}
.menu ul,
.menu li:hover ul ul,
.menu li:hover ul li:hover ul ul,
.menu li:hover ul li:hover ul li:hover ul ul,
.menu li:hover ul li:hover ul li:hover ul li:hover ul ul
{position:absolute; left:-9999px; top:-9999px; width:0; height:0; margin:0; padding:0; list-style:none;}

.menu li:hover ul.sub {
left:0;
top:35px;
background:#333; /* Submenu background color */
padding:3px;
white-space:nowrap;
width:200px;
height:auto;
z-index:3;
}
.menu li:hover ul.sub li {
display:block;
height:30px;
position:relative;
float:left;
width:200px;
font-weight:normal;
}
.menu li:hover ul.sub li a{
display:block;
height:30px;
width:200px;
line-height:30px;
text-indent:5px;
color:#ccc;
text-decoration:none;
}
.menu li ul.sub li a.fly {
/* Submenu Background Color */
background:#333 url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiRxuuoiRf7lvppP8aempK7hhO0FsS3FWc3O22OcFB4N0UPg332dcJSGtt4qOstyxLnobxNJSUSPguf5WWzGlQSJs6BJcQf0WzhJ4aInvPYL0jfU_r9mUW855Wqzd_nlfvMjbU59CtGCUQ/s1600/arrow_over.gif) 185px 10px no-repeat;}
.menu li:hover ul.sub li a:hover {
background:#515151; /* Background Color on mouseover */
color:#fff;
}
.menu li:hover ul.sub li a.fly:hover, .menu li:hover ul li:hover > a.fly {
/* Background on Mouseover */
background:#646464 url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiRxuuoiRf7lvppP8aempK7hhO0FsS3FWc3O22OcFB4N0UPg332dcJSGtt4qOstyxLnobxNJSUSPguf5WWzGlQSJs6BJcQf0WzhJ4aInvPYL0jfU_r9mUW855Wqzd_nlfvMjbU59CtGCUQ/s1600/arrow_over.gif) 185px 10px no-repeat; color:#fff;}

.menu li:hover ul li:hover ul,
.menu li:hover ul li:hover ul li:hover ul,
.menu li:hover ul li:hover ul li:hover ul li:hover ul,
.menu li:hover ul li:hover ul li:hover ul li:hover ul li:hover ul {
left:200px;
top:-4px;
background: #333; /* Background Color of the Submenu */
padding:3px;
white-space:nowrap;
width:200px;
z-index:4;
height:auto;
}
#search {
width: 228px; /* Width of the Search Box */
height: 50px;
float: right;
z-index: 2;
text-align: center;
margin-top: 5px;
margin-right: 6px;
/* Background of the Search Box */
background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitHsIiwy2LXHcj_GR7pvNixpcqBQckrWM66hwJvOtL2wKxqUzZoRCez6rrvA6KDOpc8R_5sk68_RdhcwBHxteXDsyc36w43_Ti6x3D_tAmBYOKL2WbdwWbw7XN3SlEGEACr8lmLtv86XM/s1600/searchBar1.png) no-repeat;
}
#search-box {
margin-top: 3px;
border:0px;
background: transparent;
text-align:center;
}

Screenshot

Step 2. Save the Template

Step 3. Go to Layout > click on Add a Gadget link

Step 4. Choose HTML/Javascript and paste the following inside the empty box:

<div id='menuWrapper'>
<ul class='menu'>
<li class='top'><a class='top_link' href='Link URL'><span>Title 1</span></a></li>

<li class='top'><a class='top_link' href='Link URL'><span class='down'>Title 2</span></a><ul class='sub'><li><a class='fly' href='Link URL'>Submenu 2.1</a><ul>
<li><a href='Link URL'>Submenu 2.1.1</a></li>
<li><a href='Link URL'>Submenu 2.1.2</a></li>
<li><a href='Link URL'>Submenu 2.1.3</a></li>
</ul>
</li>
<li class='mid'><a class='fly' href='Link URL'>Submenu 2.2</a>
<ul>
<li><a href='Link URL'>Submenu 2.2.1</a></li>
<li><a href='Link URL'>Submenu 2.2.2</a></li>
<li><a href='Link URL'>Submenu 2.2.3</a></li>
<li><a class='fly' href='Link URL'>Submenu 2.2.4</a>
<ul>
<li><a href='Link URL'>Submenu 2.2.4.1</a></li>
<li><a href='Link URL'>Submenu 2.2.4.2</a></li>
<li><a href='Link URL'>Submenu 2.2.4.3</a></li>
</ul>
</li>
<li><a href='Link URL'>Submenu 2.2.5</a></li>
<li><a class='fly' href='Link URL'>Submenu 2.2.6</a>
<ul>
<li><a href='Link URL'>Submenu 2.2.6.1</a></li>
<li><a href='Link URL'>Submenu 2.2.6.2</a></li>
</ul>
</li>
</ul>
</li>
<li><a href='Link URL'>Submenu 2.3</a></li>
<li><a href='Link URL'>Submenu 2.4</a></li>
<li><a href='Link URL'>Submenu 2.5</a></li>
</ul>
</li>

<li class='top'><a class='top_link' href='Link URL'><span class='down'>Title 3</span></a>
<ul class='sub'>
<li><a href='Link URL'>Submenu 3.1</a></li>
<li><a href='Link URL'>Submenu 3.2</a></li>
<li><a href='Link URL'>Submenu 3.3</a></li>
<li><a href='Link URL'>Submenu 3.4</a></li>
</ul>
</li>

<li class='top'><a class='top_link' href='Link URL'><span class='down'>Title 4</span></a>
<ul class='sub'>
<li><a href='Link URL'>Submenu 4.1</a></li>
<li><a class='fly' href='Link URL'>Submenu 4.2</a>
<ul>
<li><a href='Link URL'>Submenu 4.2.1</a></li>
<li><a href='Link URL'>Submenu 4.2.2</a></li>
<li><a href='Link URL'>Submenu 4.2.3</a></li>
<li><a href='Link URL'>Submenu 4.2.4</a></li>
<li><a href='Link URL'>Submenu 4.2.5</a></li>
<li><a href='Link URL'>Submenu 4.2.6</a></li>
</ul>
</li>
<li><a href='Link URL'>Submenu 4.3</a></li>
<li><a href='Link URL'>Submenu 4.4</a></li>
<li><a href='Link URL'>Submenu 4.5</a></li>
<li><a href='Link URL'>Submenu 4.6</a></li>
</ul>
</li>

<li class='top'><a class='top_link' href='Link URL'><span class='down'>Title 5</span></a>
<ul class='sub'>
<li><a href='Link URL'>Submenu 5.1</a></li>
<li><a href='Link URL'>Submenu 5.2</a></li>
<li><a href='Link URL'>Submenu 5.3</a></li>
</ul>
</li>


<li>
<form action='/search' id='search' method='get' name='searchForm' style='display:inline;'>
<input id='search-box' name='q' onblur='if (this.value == "") this.value = "Search here...";' onfocus='if (this.value == "Search here...") this.value = "";' size='28' type='text' value='Search here...'/></form>
</li>

</ul>
</div>

Customization:

- replace the text in blue and red with your links and titles.
- if you need more tabs, then add a line like this just above

<li class="top"><a href="Link URL" class="top_link"><span>Title</span></a></li>

- if you want to add a tab with sub-tabs, then add this code:

<li class="top"><a href="Link URL" class="top_link"><span class="down">Title</span></a>
<ul class="sub">
<li><a href="Link URL">Submenu Title</a></li>
<li><a href="Link URL">Submenu Title</a></li>
<li><a href="Link URL">Submenu Title</a></li>
</ul>
</li>

- and if you want one of the other sub-tabs have sub-tabs then remove a line like the one in orange and change it to a code like this:

<li><a href="Link URL" class="fly">Submenu Title</a>
<ul>
<li><a href="Link URL">Other Submenu</a></li>
<li><a href="Link URL">Other Submenu</a></li>
<li><a href="Link URL">Other Submenu</a></li>
</ul>
</li>

And that's it! Now Save your Widget and enjoy your new drop down menu! ;)