CSS Drop Down menu

Copy the on  html page for menu.

<div id='cssmenu'>
<ul>
   <li class='active'><a href='index.html'><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 Item</span></a></li>
               <li class='last'><a href='#'><span>Sub Item</span></a></li>
            </ul>
         </li>
         <li class='has-sub'><a href='#'><span>Product 2</span></a>
            <ul>
               <li><a href='#'><span>Sub Item</span></a></li>
               <li class='last'><a href='#'><span>Sub Item</span></a></li>
            </ul>
         </li>
      </ul>
   </li>
   <li><a href='#'><span>About</span></a></li>
   <li class='last'><a href='#'><span>Contact</span></a></li>
</ul>
</div>


CSS code

@import url(http://fonts.googleapis.com/css?family=Source+Sans+Pro:500);
/* 2f4b87 */
/* 2f4b87 */
/* #1f325d */
/* Menu CSS */#cssmenu {
  width: auto;
}
#cssmenu,
#cssmenu ul,
#cssmenu ul li,
#cssmenu ul li a {
  padding: 0;
  margin: 0;
  line-height: 1;
  font-family: 'Source Sans Pro', sans-serif;
  font-weight: 500;
  font-size: 16px;
  color: #ffffff;
  -webkit-transition: all ease .3s;
  -o-transition: all ease .3s;
  -moz-transition: all ease .3s;
  -ms-transition: all ease .3s;
  transition: all ease .3s;
}
#cssmenu:before,
#cssmenu:after,
#cssmenu > ul:before,
#cssmenu > ul:after {
  content: '';
  display: table;
}
#cssmenu:after,
#cssmenu > ul:after {
  clear: both;
}
#cssmenu a {
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
}
#cssmenu ul {
  background: #3b5998;
  border-radius: 3px;
  border: 1px solid #2b4479;
  border: 1px solid #2d4373;
  -webkit-box-shadow: 0 1px 2px rgba(2, 2, 2, 0.25), inset 0 1px 1px rgba(255, 255, 255, 0.15);
  -o-box-shadow: 0 1px 2px rgba(2, 2, 2, 0.25), inset 0 1px 1px rgba(255, 255, 255, 0.15);
  -moz-box-shadow: 0 1px 2px rgba(2, 2, 2, 0.25), inset 0 1px 1px rgba(255, 255, 255, 0.15);
  -ms-box-shadow: 0 1px 2px rgba(2, 2, 2, 0.25), inset 0 1px 1px rgba(255, 255, 255, 0.15);
  box-shadow: 0 1px 2px rgba(2, 2, 2, 0.25), inset 0 1px 1px rgba(255, 255, 255, 0.15);
}
#cssmenu ul > li {
  float: left;
  list-style: none;
}
#cssmenu ul > li > a {
  display: block;
  text-decoration: none;
  padding: 15px 44px;
  position: relative;
}
#cssmenu ul > li > a:hover {
  background: #2d4373;
  -webkit-box-shadow: inset 0 0 1px #1e2e4f;
  -o-box-shadow: inset 0 0 1px #1e2e4f;
  -moz-box-shadow: inset 0 0 1px #1e2e4f;
  -ms-box-shadow: inset 0 0 1px #1e2e4f;
  box-shadow: inset 0 0 1px #1e2e4f;
  -webkit-transition: all ease .3s;
  -o-transition: all ease .3s;
  -moz-transition: all ease .3s;
  -ms-transition: all ease .3s;
  transition: all ease .3s;
}
#cssmenu ul > li > a:hover:before {
  content: '';
  z-index: 2;
  position: absolute;
  border: 1px solid white;
  border-top: 0;
  border-bottom: 0;
  border-right: 0;
  width: 100%;
  height: 100%;
  top: 0;
  left: -1px;
  opacity: .2;
}
#cssmenu ul > li > a:hover:after {
  content: '';
  z-index: 2;
  position: absolute;
  border: 1px solid white;
  border-top: 0;
  border-bottom: 0;
  border-left: 0;
  width: 100%;
  height: 100%;
  top: 0;
  right: -1px;
  opacity: .2;
}
#cssmenu > ul > li > ul {
  opacity: 0;
  visibility: hidden;
  position: absolute;
}
#cssmenu > ul > li:hover > ul {
  opacity: 1;
  visibility: visible;
  position: absolute;
  border-radius: 0 0 3px 3px;
  -webkit-box-shadow: none;
  -o-box-shadow: none;
  -moz-box-shadow: none;
  -ms-box-shadow: none;
  box-shadow: none;
}
#cssmenu > ul > li > ul {
  width: 200px;
  position: absolute;
}
#cssmenu > ul > li > ul > li {
  float: none;
  position: relative;
}
#cssmenu > ul > li > ul > li > ul {
  opacity: 0;
  visibility: hidden;
  position: absolute;
}
#cssmenu > ul > li > ul > li:hover > ul {
  opacity: 1;
  visibility: visible;
  position: absolute;
}
#cssmenu > ul > li > ul > li > ul {
  left: 200px;
  top: 1px;
  width: 200px;
}
#cssmenu > ul > li > ul > li > ul > li {
  float: none;

}