Hence, its easy to navigate visitors thought this menu bar.This is great design with Css. you ca do with easy steps. Follow these steps to add it your blog.
  
Demo

1. Log in to blogger account and Go to Design >> Edit HTML
    (make sure backup your template first)

2. Put checked marked in Expand Widget Templates

3. Find this tag by using Ctrl+F    ]]></b:skin>

4. Paste below code Before ]]></b:skin> tag

#hb-menu, #hb-menu ul {
margin: 0;
padding: 0;
list-style: none;
}
#hb-menu {
width: 960px;
margin: 60px auto;
border: 1px solid #222;
background-color: #111;
background-image: -moz-linear-gradient(#444, #111);
background-image: -webkit-gradient(linear, left top, left bottom, from(#444), to(#111));
background-image: -webkit-linear-gradient(#444, #111);
background-image: -o-linear-gradient(#444, #111);
background-image: -ms-linear-gradient(#444, #111);
background-image: linear-gradient(#444, #111);
-moz-border-radius: 6px;
-webkit-border-radius: 6px;
border-radius: 6px;
-moz-box-shadow: 0 1px 1px #777;
-webkit-box-shadow: 0 1px 1px #777;
box-shadow: 0 1px 1px #777;
}
#hb-menu:before,
#hb-menu:after {
content: "";
display: table;
}
#hb-menu:after {
clear: both;
}
#hb-menu {
zoom:1;
}
#hb-menu li {
float: left;
border-right: 1px solid #222;
-moz-box-shadow: 1px 0 0 #444;
-webkit-box-shadow: 1px 0 0 #444;
box-shadow: 1px 0 0 #444;
position: relative;
}
#hb-menu a {
float: left;
padding: 12px 30px;
color: #999;
text-transform: uppercase;
font: bold 12px Arial, Helvetica;
text-decoration: none;
text-shadow: 0 1px 0 #000;
}
#hb-menu li:hover > a {
color: #fafafa;
}
*html #hb-menu li a:hover { /* IE6 only */
color: #fafafa;
}
#hb-menu ul {
margin: 20px 0 0 0;
_margin: 0; /*IE6 only*/
opacity: 0;
visibility: hidden;
position: absolute;
top: 38px;
left: 0;
z-index: 9999;
background: #444;
background: -moz-linear-gradient(#444, #111);
background: -webkit-gradient(linear,left bottom,left top,color-stop(0, #111),color-stop(1, #444));
background: -webkit-linear-gradient(#444, #111);
background: -o-linear-gradient(#444, #111);
background: -ms-linear-gradient(#444, #111);
background: linear-gradient(#444, #111);
-moz-box-shadow: 0 -1px rgba(255,255,255,.3);
-webkit-box-shadow: 0 -1px 0 rgba(255,255,255,.3);
box-shadow: 0 -1px 0 rgba(255,255,255,.3);
-moz-border-radius: 3px;
-webkit-border-radius: 3px;
border-radius: 3px;
-webkit-transition: all .2s ease-in-out;
-moz-transition: all .2s ease-in-out;
-ms-transition: all .2s ease-in-out;
-o-transition: all .2s ease-in-out;
transition: all .2s ease-in-out;
}
#hb-menu li:hover > ul {
opacity: 1;
visibility: visible;
margin: 0;
}
#hb-menu ul ul {
top: 0;
left: 150px;
margin: 0 0 0 20px;
_margin: 0; /*IE6 only*/
-moz-box-shadow: -1px 0 0 rgba(255,255,255,.3);
-webkit-box-shadow: -1px 0 0 rgba(255,255,255,.3);
box-shadow: -1px 0 0 rgba(255,255,255,.3);
}
#hb-menu ul li {
float: none;
display: block;
border: 0;
_line-height: 0; /*IE6 only*/
-moz-box-shadow: 0 1px 0 #111, 0 2px 0 #666;
-webkit-box-shadow: 0 1px 0 #111, 0 2px 0 #666;
box-shadow: 0 1px 0 #111, 0 2px 0 #666;
}
#hb-menu ul li:last-child {
-moz-box-shadow: none;
-webkit-box-shadow: none;
box-shadow: none;
}
#hb-menu ul a {
padding: 10px;
width: 130px;
_height: 10px; /*IE6 only*/
display: block;
white-space: nowrap;
float: none;
text-transform: none;
}
#hb-menu ul a:hover {
background-color: #0186ba;
background-image: -moz-linear-gradient(#04acec, #0186ba);
background-image: -webkit-gradient(linear, left top, left bottom, from(#04acec), to(#0186ba));
background-image: -webkit-linear-gradient(#04acec, #0186ba);
background-image: -o-linear-gradient(#04acec, #0186ba);
background-image: -ms-linear-gradient(#04acec, #0186ba);
background-image: linear-gradient(#04acec, #0186ba);
}
#hb-menu ul li:first-child > a {
-moz-border-radius: 3px 3px 0 0;
-webkit-border-radius: 3px 3px 0 0;
border-radius: 3px 3px 0 0;
}
#hb-menu ul li:first-child > a:after {
content: '';
position: absolute;
left: 40px;
top: -6px;
border-left: 6px solid transparent;
border-right: 6px solid transparent;
border-bottom: 6px solid #444;
}
#hb-menu ul ul li:first-child a:after {
left: -6px;
top: 50%;
margin-top: -6px;
border-left: 0;
border-bottom: 6px solid transparent;
border-top: 6px solid transparent;
border-right: 6px solid #3b3b3b;
}
#hb-menu ul li:first-child a:hover:after {
border-bottom-color: #04acec;
}
#hb-menu ul ul li:first-child a:hover:after {
border-right-color: #0299d3;
border-bottom-color: transparent;
}
#hb-menu ul li:last-child > a {
-moz-border-radius: 0 0 3px 3px;
-webkit-border-radius: 0 0 3px 3px;
border-radius: 0 0 3px 3px;
}

5. Now Find this code  by using Ctrl+F <div id='content-wrapper'>

6.  Paste below code Before <div id='content-wrapper'> code

<ul id="hb-menu"> 
<li><a href="#">Home</a></li> 
<li> 
<a href="#">Categories</a> 
<ul> 
<li><a href="#">CSS</a></li> 
<li><a href="#">Graphic design</a><ul>
<li><a href="#">Link 1</a></li>
<li><a href="#">Link 2</a></li>
<li><a href="#">Link 3</a></li>
<li><a href="#">Link 4</a></li>
</ul>   </li> 
<li><a href="#">Development tools</a></li> 
<li><a href="#">Web design</a></li> 
</ul> 
</li> 
<li><a href="#">Work</a></li> 
<li><a href="#">About</a>
<ul> 
<li><a href="#">CSS</a>
<ul>
<li><a href="#">Link 5</a></li>
<li><a href="#">Link 6</a></li>
<li><a href="#">Link 7</a></li>
<li><a href="#">Link 8</a></li>
</ul>   

</li> 
<li><a href="#">Graphic design</a></li> 
<li><a href="#">Development tools</a></li> 
<li><a href="#">Web design</a></li> 
</ul> 

</li> 
<li><a href="#">Contact</a></li> 
<li><a href="http://www.bloggertrix.com/">Add This  »</a></li></ul>

*Replace # With your URL
*Replace Name with as your like.

7. Now save your template
 you are done.

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