Create CSS3 Dropdown menu

Create CSS3 Dropdown menu

<style type="text/css">#cssmenu ul,
#cssmenu li,
#cssmenu span,
#cssmenu a {
  margin: 0;
  padding: 0;
  position: relative;
}
#cssmenu {
  height: 49px;
  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, #32323a 0%, #141414 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #32323a), color-stop(100%, #141414));
  background: -webkit-linear-gradient(top, #32323a 0%, #141414 100%);
  background: -o-linear-gradient(top, #32323a 0%, #141414 100%);
  background: -ms-linear-gradient(top, #32323a 0%, #141414 100%);
  background: linear-gradient(to bottom, #32323a 0%, #141414 100%);
  border-bottom: 2px solid #0fa1e0;
}
#cssmenu:after,
#cssmenu ul:after {
  content: '';
  display: block;
  clear: both;
}
#cssmenu a {
  background: #141414;
  background: -moz-linear-gradient(top, #32323a 0%, #141414 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #32323a), color-stop(100%, #141414));
  background: -webkit-linear-gradient(top, #32323a 0%, #141414 100%);
  background: -o-linear-gradient(top, #32323a 0%, #141414 100%);
  background: -ms-linear-gradient(top, #32323a 0%, #141414 100%);
  background: linear-gradient(to bottom, #32323a 0%, #141414 100%);
  color: #ffffff;
  display: inline-block;
  font-family: Helvetica, Arial, Verdana, sans-serif;
  font-size: 12px;
  line-height: 49px;
  padding: 0 20px;
  text-decoration: none;
}
#cssmenu ul {
  list-style: none;
}
#cssmenu > ul {
  float: left;
}
#cssmenu > ul > li {
  float: left;
}
#cssmenu > 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;
}
#cssmenu > 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;
}
#cssmenu > 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;
}
#cssmenu > ul > li.active a {
  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, #26262c 0%, #070707 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #26262c), color-stop(100%, #070707));
  background: -webkit-linear-gradient(top, #26262c 0%, #070707 100%);
  background: -o-linear-gradient(top, #26262c 0%, #070707 100%);
  background: -ms-linear-gradient(top, #26262c 0%, #070707 100%);
  background: linear-gradient(to bottom, #26262c 0%, #070707 100%);
}
#cssmenu > ul > li:hover > a {
  background: #070707;
  background: -moz-linear-gradient(top, #26262c 0%, #070707 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #26262c), color-stop(100%, #070707));
  background: -webkit-linear-gradient(top, #26262c 0%, #070707 100%);
  background: -o-linear-gradient(top, #26262c 0%, #070707 100%);
  background: -ms-linear-gradient(top, #26262c 0%, #070707 100%);
  background: linear-gradient(to bottom, #26262c 0%, #070707 100%);
  box-shadow: inset 0 0 3px #000000;
  -moz-box-shadow: inset 0 0 3px #000000;
  -webkit-box-shadow: inset 0 0 3px #000000;
}
#cssmenu .has-sub {
  z-index: 1;
}
#cssmenu .has-sub:hover > ul {
  display: block;
}
#cssmenu .has-sub ul {
  display: none;
  position: absolute;
  width: 200px;
  top: 100%;
  left: 0;
}
#cssmenu .has-sub ul li {
  *margin-bottom: -1px;
}
#cssmenu .has-sub ul li a {
  background: #0fa1e0;
  border-bottom: 1px dotted #6fc7ec;
  filter: none;
  font-size: 11px;
  display: block;
  line-height: 120%;
  padding: 10px;
}
#cssmenu .has-sub ul li:hover a {
  background: #0c7fb0;
}
#cssmenu .has-sub .has-sub:hover > ul {
  display: block;
}
#cssmenu .has-sub .has-sub ul {
  display: none;
  position: absolute;
  left: 100%;
  top: 0;
}
#cssmenu .has-sub .has-sub ul li a {
  background: #0c7fb0;
  border-bottom: 1px dotted #6db2d0;
}
#cssmenu .has-sub .has-sub ul li a:hover {
  background: #095c80;
}</style>
<div id='cssmenu'>
<ul>
   <li><a href='#'><span>Home</span></a></li>
   <li class='has-sub '><a href='#'><span>Products</span></a>
      <ul>
         <li class='has-sub '><a href='#'><span>Product 1</span></a>
            <ul>
               <li><a href='#'><span>Sub Product</span></a></li>
               <li><a href='#'><span>Sub Product</span></a></li>
            </ul>
         </li>
         <li class='has-sub '><a href='#'><span>Product 2</span></a>
            <ul>
               <li><a href='#'><span>Sub Product</span></a></li>
               <li><a href='#'><span>Sub Product</span></a></li>
            </ul>
         </li>
      </ul>
   </li>
   <li><a href='#'><span>About</span></a></li>
   <li><a href='#'><span>Contact</span></a></li>
</ul>
</div>