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                <!-- Original pen ( ~July 2012) lost by CodePen, this is a recreation with their assistance to get the old code. -->
<nav role="navigation">
  <h1 onclick = "void(0);">Menu</h1>
    <li><a href="#">Bio</a></li>
    <li><a href="#">Blog</a></li>
    <li><a href="#">Books</a></li>
    <li><a href="#">Articles</a></li>
    <li><a href="#">Contact</a></li>

The onclick attributes are to allow Safari on iOS to see these otherwise non-clickable elements as clickable so it can then apply the hover styles as if they were clicks.


                .html {
  background-color: #6D695C;

  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  /*font-size: 2.5em;*/ }

nav {
  width: 5em;
  height: 8em;
  float: right;
  padding: 0;
  overflow: hidden; }

nav:hover {
  background-color: rgba(0, 0, 0, 0.4);
  width: 16em;
  height: 15em;
  border-radius: 0 0 0 15em; }

body {
  background-color: #eee; }

nav h1 {
  position: relative;
  top: -.75em;
  right: -.5em;
  margin: 0;
  background-color: #000;
  color: #000;
  z-index: 1;
  font-size: 2em;
  line-height: 100%;
  width: 1em;
  padding: 1em .5em 1.25em 1em;
  border-radius: 3.0em 0 0 3.0em;
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform: rotate(-45deg);
  overflow: hidden; }

nav h1::before {
  content: "\AB";/*&#171; «*/
  /*content: "\21D0";*//*&#8656; ⇐*/
  color: #fff;
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg); }

nav:hover h1 {
  display: none; }

nav ol {
  margin: 0;
  padding: 0;
  list-style-type: none; }

a {
  display: block;
  position: absolute;
  top: -10em;
  right: 0em;
  border-radius: 4em;
  border: .15em solid #fff;
  padding: 1.5em 0;
  width: 4.5em;
  text-align: center;
  box-shadow: .45em 0 1.5em rgba(50, 50, 50, 0.75);
  -webkit-transition: all 0.2s ease-in;
  -moz-transition: all 0.2s ease-in;
  -ms-transition: all 0.2s ease-in;
  -o-transition: all 0.2s ease-in;
  transition: all 0.2s ease-in; }

nav:hover a {
  /*display: block;*/ }

a:link, a:hover, a:focus, a:active, a:visited {
  text-decoration: none;
  color: #ddd;
  background-color: #000; }

a:hover, a:focus, a:active {
  background-color: #222;
  color: #fff;
  text-shadow: 0em 0em 0.2em rgba(255, 255, 255, 0.8);}

nav:hover li:nth-child(1) a {
  right: 13.5em;
  top: .2em; }

nav:hover li:nth-child(2) a {
  right: 12em;
  top: 4.75em; }

nav:hover li:nth-child(3) a {
  right: 9.0em;
  top: 8.5em; }

nav:hover li:nth-child(4) a {
  right: 4.75em;
  top: 11em; }

nav:hover li:nth-child(5) a {
  right: 0;
  top: 12em; }