#dropmenu_md ul,
#dropmenu_md li,
#dropmenu_md span,
#dropmenu_md a {
margin : 0;
padding : 0;
position : relative;
}
#dropmenu_md {
line-height: 1;
border-radius: 5px 5px 0 0;
-moz-border-radius: 5px 5px 0 0;
-webkit-border-radius: 5px 5px 0 0;
background : #141414;
background : -moz-linear-gradient(top, #333333 0%, #141414 100%);
background : -webkit-gradient(linear, left top, left bottom, color-stop(0%, #333333), color-stop(100%, #141414));
background : -webkit-linear-gradient(top, #333333 0%, #141414 100%);
background : -o-linear-gradient(top, #333333 0%, #141414 100%);
background : -ms-linear-gradient(top, #333333 0%, #141414 100%);
background : linear-gradient(to bottom, #333333 0%, #141414 100%);
border-bottom: 2px solid #0fa1e0;
width : auto;
}
#dropmenu_md:after,
#dropmenu_md ul:after {
content : '';
display : block;
clear : both;
}
#dropmenu_md a {
background : #141414;
background : -moz-linear-gradient(top, #333333 0%, #141414 100%);
background : -webkit-gradient(linear, left top, left bottom, color-stop(0%, #333333), color-stop(100%, #141414));
background : -webkit-linear-gradient(top, #333333 0%, #141414 100%);
background : -o-linear-gradient(top, #333333 0%, #141414 100%);
background : -ms-linear-gradient(top, #333333 0%, #141414 100%);
background : linear-gradient(to bottom, #333333 0%, #141414 100%);
color : #ffffff;
display : block;
font-family: Helvetica, Arial, Verdana, sans-serif;
padding : 19px 20px;
text-decoration: none;
}
#dropmenu_md ul {
list-style: none;
}
#dropmenu_md > ul > li {
display : inline-block;
float : left;
margin : 0;
}
#dropmenu_md.align-center {
text-align: center;
}
#dropmenu_md.align-center > ul > li {
float : none;
}
#dropmenu_md.align-center ul ul {
text-align: left;
}
#dropmenu_md.align-right > ul {
float : right;
}
#dropmenu_md.align-right ul ul {
text-align: right;
}
#dropmenu_md > ul > li > a {
color : #ffffff;
font-size: 12px;
}
#dropmenu_md > ul > li:hover:after {
content : '';
display : block;
width : 0;
height : 0;
position : absolute;
left : 50%;
bottom : 0;
border-left: 10px solid transparent;
border-right: 10px solid transparent;
border-bottom: 10px solid #0fa1e0;
margin-left: -10px;
}
#dropmenu_md > ul > li:first-child > a {
border-radius: 5px 0 0 0;
-moz-border-radius: 5px 0 0 0;
-webkit-border-radius: 5px 0 0 0;
}
#dropmenu_md.align-right > ul > li:first-child > a,
#dropmenu_md.align-center > ul > li:first-child > a {
border-radius: 0;
-moz-border-radius: 0;
-webkit-border-radius: 0;
}
#dropmenu_md.align-right > ul > li:last-child > a {
border-radius: 0 5px 0 0;
-moz-border-radius: 0 5px 0 0;
-webkit-border-radius: 0 5px 0 0;
}
#dropmenu_md > ul > li.active > a,
#dropmenu_md > ul > li:hover > a {
color : #ffffff;
box-shadow: inset 0 0 3px #000000;
-moz-box-shadow: inset 0 0 3px #000000;
-webkit-box-shadow: inset 0 0 3px #000000;
background : #070707;
background : -moz-linear-gradient(top, #262626 0%, #070707 100%);
background : -webkit-gradient(linear, left top, left bottom, color-stop(0%, #262626), color-stop(100%, #070707));
background : -webkit-linear-gradient(top, #262626 0%, #070707 100%);
background : -o-linear-gradient(top, #262626 0%, #070707 100%);
background : -ms-linear-gradient(top, #262626 0%, #070707 100%);
background : linear-gradient(to bottom, #262626 0%, #070707 100%);
}
#dropmenu_md .has-sub {
z-index: 1;
}
#dropmenu_md .has-sub:hover > ul {
display : block;
}
#dropmenu_md .has-sub ul {
display : none;
position : absolute;
width : 200px;
top : 100%;
left : 0;
}
#dropmenu_md.align-right .has-sub ul {
left : auto;
right : 0;
}
#dropmenu_md .has-sub ul li {
*margin-bottom: -1px;
}
#dropmenu_md .has-sub ul li a {
background : #0fa1e0;
border -bottom: 1px dotted #31b7f1;
font-size: 11px;
filter : none;
display : block;
line-height: 120%;
padding : 10px;
color : #ffffff;
}
#dropmenu_md .has-sub ul li:hover a {
background : #0c7fb0;
}
#dropmenu_md ul ul li:hover > a {
color : #ffffff;
}
#dropmenu_md .has-sub .has-sub:hover > ul {
display : block;
}
#dropmenu_md .has-sub .has-sub ul {
display : none;
position : absolute;
left : 100%;
top : 0;
}
#dropmenu_md.align-right .has-sub .has-sub ul,
#dropmenu_md.align-right ul ul ul {
left : auto;
right : 100%;
}
#dropmenu_md .has-sub .has-sub ul li a {
background : #0c7fb0;
border-bottom: 1px dotted #31b7f1;
}
#dropmenu_md .has-sub .has-sub ul li a:hover {
background : #0a6d98;
}
#dropmenu_md ul ul li.last > a,
#dropmenu_md ul ul li:last-child > a,
#dropmenu_md ul ul ul li.last > a,
#dropmenu_mdul ul ul li:last-child > a,
#dropmenu_md .has-sub ul li:last-child > a,
#dropmenu_md .has-sub ul li.last > a {
border-bottom: 0;
}

<div id='cssmenu'>
<ul>
<li><a href='#'><span>Home</span></a></li>
<li class='active has-sub'><a href='#'><span>menu1</span></a>
<ul>
<li class='has-sub'><a href='#'><span>menu1 1</span></a>
<ul>
<li><a href='#'><span>Sub menut</span></a></li>
<li class='last'><a href='#'><span>Sub menu</span></a></li>
</ul>
</li>
<li class='has-sub'><a href='#'><span>menu 2</span></a>
<ul>
<li><a href='#'><span>Sub menu</span></a></li>
<li class='last'><a href='#'><span>Sub menu</span></a></li>
</ul>
</li>
</ul>
</li>
<li><a href='#'><span>Trợ Giúp</span></a></li>
<li class='last'><a href='#'><span>Hỏi Đáp</span></a></li>
</ul>
</div>