<div id="container">
    <nav>
        <ul class="cf">
            <li predictive-item><a href="#">Menu Item 1</a></li>
            <li predictive-item><a class="dropdown" href="#">Menu Item 2</a>
                <ul>
                    <li><a href="#">Sub-menu Item 1</a></li>
                    <li><a href="#">Sub-menu Item 2</a></li>
                    <li><a href="#">Sub-menu Item 3</a></li>
                </ul>
                </li>
            <li predictive-item><a href="#">Menu Item 3</a></li>
        </ul>
    </nav>
    <button predictive-item>Button Item</button>
</div>
#container {
  width: 900px;
  height: 550px;
  margin: 20px auto;
  background-color: #f2f2f2;
  position: relative;
  border-radius: 10px;
  box-sizing: border-box;
  text-align: center;
}

nav ul {
  background: #ddd;
  font-size: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  text-align: center;
  width: 100%;
}

nav li {
  display: inline-block;
  margin: 0;
  padding: 0;
  position: relative;
  min-width: 33%;
}

nav a {
  background: #ddd;
  color: #444;
  display: block;
  font: bold 16px/50px sans-serif;
  padding: 0 25px;
  text-align: center;
  text-decoration: none;
  -webkit-transition: all 0.25s ease;
  -moz-transition: all 0.25s ease;
  -ms-transition: all 0.25s ease;
  -o-transition: all 0.25s ease;
  transition: all 0.25s ease;
}

nav .dropdown:after {
  content: " \25bc";
}

nav li:hover a {
  background: lightgreen;
}

nav li ul {
  left: 0;
  opacity: 0;
  position: absolute;
  top: 35px;
  visibility: hidden;
  z-index: 1;
  -webkit-transition: all 0.25s ease;
  -moz-transition: all 0.25s ease;
  -ms-transition: all 0.25s ease;
  -o-transition: all 0.25s ease;
  transition: all 0.25s ease;
}

nav li:hover ul {
  opacity: 1;
  top: 50px;
  visibility: visible;
}

nav li ul li {
  width: 100%;
}

nav li ul a:hover {
  background: #65e765;
}

button {
  background: #ddd;
  color: #444;
  font: bold 16px/50px sans-serif;
  padding: 0 25px;
  text-align: center;
  -webkit-transition: all 0.25s ease;
  -moz-transition: all 0.25s ease;
  -ms-transition: all 0.25s ease;
  -o-transition: all 0.25s ease;
  transition: all 0.25s ease;
  min-width: 33%;
  border: 0px;
  margin-top: 200px;
}

button:hover {
  background: lightgreen;
  cursor: pointer;
}
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External CSS

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External JavaScript

  1. https://cdn.rawgit.com/prozoroff/predictive-ui/ca0b8b34/dist/predictive-ui.js