Horizontal 2 niveles (en Eklablog no funciona)

 <nav class="wrapper">
  <ul class="main">
    <li class="front"><a href="#">Item</a></li>
    <li class="front"><a href="#">Item</a></li>
    <li class="front"><a href="#">Hover</a>
      <!--2---------------> 
       <ul class="sub">
        <li class="bottom"><a href="#">Sub Item</a></li>
        <li class="bottom"><a href="#">Sub Item</a></li>
        <li class="bottom"><a href="#">Sub Item</a></li>
      </ul>
    </li>
    <!-----------------> 
    <li class="front"><a href="#">Item</a></li>
    <li class="front"><a href="#">Item</a></li>
  </ul>
</nav>

CSS

nav {
  color: #1d1d1d;
  margin: 0 auto;
  width: 541px;
}

a {
  text-decoration: none;
  color: inherit;
}

nav ul ul {
  -webkit-transition: all 500ms ease-in-out 500ms;
  -moz-transition: all 500ms ease-in-out 500ms;
  -ms-transition: all 500ms ease-in-out 500ms;
  -o-transition: all 500ms ease-in-out 500ms;
  transition: all 500ms ease-in-out 500ms;
  -webkit-transform: rotateX(-90deg);
  -moz-transform: rotateX(-90deg);
  -ms-transform: rotateX(-90deg);
  -o-transform: rotateX(-90deg);
  transform: rotateX(-90deg);
  -webkit-transform-origin: 0% 0%;
  -moz-transform-origin: 0% 0%;
  -ms-transform-origin: 0% 0%;
  -o-transform-origin: 0% 0%;
  transform-origin: 0% 0%;
  -webkit-backface-visibility: hidden;
  -moz-backface-visibility: hidden;
  -ms-backface-visibility: hidden;
  -o-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-box-shadow: 0px -100px 500px rgba(0,0,0,0);
  box-shadow: 0px -100px 500px rgba(0,0,0,0);
}

nav ul li:hover > ul {
  -webkit-transition: all 500ms ease-in-out 0ms;
  -moz-transition: all 500ms ease-in-out 0ms;
  -ms-transition: all 500ms ease-in-out 0ms;
  -o-transition: all 500ms ease-in-out 0ms;
  transition: all 500ms ease-in-out 0ms;
  -webkit-transform: rotateX(0deg);
  -moz-transform: rotateX(0deg);
  -ms-transform: rotateX(0deg);
  -o-transform: rotateX(0deg);
  transform: rotateX(0deg);
  -webkit-box-shadow: 10px 10px 10px rgba(0,0,0,0.1);
  box-shadow: 10px 10px 10px rgba(0,0,0,0.1);
}

nav ul {
  background-image: -webkit-linear-gradient(top, #ff7000 70%, #ff560f 100%);
  background-image: linear-gradient(to bottom, #ff7000 70%, #ff560f 100%);
  padding: 0;
  list-style: none;
  position: relative;
  display: inline-table;
  border-radius: 5px;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  -webkit-perspective: 200px;
  -ms-perspective: 200px;
  perspective: 200px;
}

nav ul:after {
  content: "";
  clear: both;
  display: block;
}

nav ul li {
  float: left;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  -webkit-perspective: 200px;
  -ms-perspective: 200px;
  perspective: 200px;
  border-right: 1px solid #890456;
}

nav ul > li:last-of-type {
  border-right: none;
  border-radius: 0 5px 5px 0;
}

nav ul span li { border-right: 1px solid #890456; }

nav ul li:first-of-type { border-radius: 5px 0 0 5px; }

nav ul li:hover {
  background-image: -webkit-linear-gradient(top, #ff8931, #ff5012);
  background-image: linear-gradient(to bottom, #ff8931, #ff5012);
}

nav ul li:hover > a { color: #fff; }

nav ul li a {
  display: block;
  padding: 10px 31px 10px 32px;
}

nav ul ul {
  position: absolute;
  top: 100%;
  padding: 0;
  border-radius: 0 0 5px 5px;
  background: #ff560f;
}

nav ul ul li {
  float: none;
  position: relative;
  border: none;
}

nav ul ul li:last-of-type { border-radius: 0 0 5px 5px; }

nav ul ul li a { padding: 8px 21px; }

CSS mejorada

nav {
  color: #1d1d1d;
  margin: 0 auto;
  width: 841px;
}

a {
  text-decoration: none;
  color: inherit;
}

nav ul ul {
  -webkit-transition: all 500ms ease-in-out 500ms;
  -moz-transition: all 500ms ease-in-out 500ms;
  -ms-transition: all 500ms ease-in-out 500ms;
  -o-transition: all 500ms ease-in-out 500ms;
  transition: all 500ms ease-in-out 500ms;
  -webkit-transform: rotateX(-90deg);
  -moz-transform: rotateX(-90deg);
  -ms-transform: rotateX(-90deg);
  -o-transform: rotateX(-90deg);
  transform: rotateX(-90deg);
  -webkit-transform-origin: 0% 0%;
  -moz-transform-origin: 0% 0%;
  -ms-transform-origin: 0% 0%;
  -o-transform-origin: 0% 0%;
  transform-origin: 0% 0%;
  -webkit-backface-visibility: hidden;
  -moz-backface-visibility: hidden;
  -ms-backface-visibility: hidden;
  -o-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-box-shadow: 0px -100px 500px rgba(0,0,0,0);
  box-shadow: 0px -100px 500px rgba(0,0,0,0);
}

nav ul li:hover > ul {
  -webkit-transition: all 500ms ease-in-out 0ms;
  -moz-transition: all 500ms ease-in-out 0ms;
  -ms-transition: all 500ms ease-in-out 0ms;
  -o-transition: all 500ms ease-in-out 0ms;
  transition: all 500ms ease-in-out 0ms;
  -webkit-transform: rotateX(0deg);
  -moz-transform: rotateX(0deg);
  -ms-transform: rotateX(0deg);
  -o-transform: rotateX(0deg);
  transform: rotateX(0deg);
  -webkit-box-shadow: 10px 10px 10px rgba(0,0,0,0.1);
  box-shadow: 10px 10px 10px rgba(0,0,0,0.1);
}

nav ul {
  background-image: -webkit-linear-gradient(top, #ff7000 70%, #ff560f 100%);
  background-image: linear-gradient(to bottom, #ff7000 70%, #ff560f 100%);
  padding: 0;
  list-style: none;
  position: relative;
  display: inline-table;
  border-radius: 5px;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  -webkit-perspective: 200px;
  -ms-perspective: 200px;
  perspective: 200px;
}

nav ul:after {
  content: "";
  clear: both;
  display: block;
}

nav ul li {
  float: left;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  -webkit-perspective: 200px;
  -ms-perspective: 200px;
  perspective: 200px;
  border-right: 1px solid #890456;
}

nav ul > li:last-of-type {
  border-right: none;
  border-radius: 0 5px 5px 0;
}

nav ul span li { border-right: 1px solid #890456; }

nav ul li:first-of-type { border-radius: 5px 0 0 5px; }

nav ul li:hover {
  background-image: -webkit-linear-gradient(top, #ff8931, #ff5012);
  background-image: linear-gradient(to bottom, #ff8931, #ff5012);
  border-radius: 5px;
  border: 1px solid #fff;
}

nav ul li:hover > a { color: #fff; }

nav ul li a {
  display: block;
  padding: 10px 11px 10px 12px;
}

nav ul ul {
  position: absolute;
  top: 100%;
  padding: 0;
  border-radius: 0 0 5px 5px;
  background: #ff560f;
}

nav ul ul li {
  float: none;
  position: relative;
  border: none;
}

nav ul ul li:last-of-type { border-radius: 0 0 5px 5px; }

nav ul ul li a { padding: 8px 11px; }