HTML

CSS

JS

body {
  font-family: 'Lucida Grande', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 13px;
  text-align: center;
}

ul {
  text-align: left;
  display: inline;
  margin: 0;
  padding: 15px 4px 17px 0;
  list-style: none;
}

ul li {
  font: bold 12px/18px sans-serif;
  display: inline-block;
  margin-right: -4px;
  position: relative;
  padding: 15px 20px;
  color: #000;
  background: #fff;
  cursor: pointer;
  -webkit-transition: all 0.2s;
  -moz-transition: all 0.2s;
  -ms-transition: all 0.2s;
  -o-transition: all 0.2s;
  transition: all 0.2s;
}

ul li:hover {
  background: #555;
  color: #fff;
}

ul li ul {
  padding: 0;
  position: absolute;
  top: 48px;
  left: 0;
  width: 150px;
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
  display: none;
  opacity: 0;
  visibility: hidden;
  -webkit-transiton: opacity 0.2s;
  -moz-transition: opacity 0.2s;
  -ms-transition: opacity 0.2s;
  -o-transition: opacity 0.2s;
  -transition: opacity 0.2s;
}

ul li ul li {
  background: #555;
  display: block;
  color: #fff;
  text-shadow: 0 -1px 0 #000;
}

ul li ul li:hover { background: #666; }

ul li:hover ul {
  display: block;
  opacity: 1;
  visibility: visible;
}

CSS Only Dropdown, no JavaScript

This is an example of how you can build a dropdown without using JavaScript. The entire dropdown is an ul, unordered list. Dropdown is shown on hover by applying the display: block property to the ul.

You can use this dropdown to build the menu or sub menu for your application.