Accordion Menu CSS3 Transitions

I create stylish css3 transitions into an accordion menu . I hope you like it.How to use it:
Build the structure for an accordion menu.

<nav id="menu_box">
  <ul class="menu">
    <li> <a href="#">Menu 1</a>
      <ul>
        <li><a href="#">Menu 1.1</a></li>
        <li><a href="#">Menu 1.2</a></li>
      </ul>
    </li>
    <li> <a href="#">Menu 2</a>
      <ul>
        <li><a href="#">Menu 2.1</a></li>
        <li><a href="#">Menu 2.2</a></li>
        <li><a href="#">Menu 2.3</a></li>
      </ul>
    </li>
    <li> <a href="#">Menu 3</a>
      <ul>
        <li><a href="#">Menu 3.1</a></li>
        <li><a href="#">Menu 3.2</a></li>
        <li><a href="#">Menu 3.3</a></li>
        <li><a href="#">Menu 3.4</a></li>
      </ul>
    </li>
    <li> <a href="#">Menu 4</a> </li>
  </ul>
</nav>

put it as you like Style CSS fot accordion menu.

.menu {
  margin: 0 auto;
  padding: 0;
  width: 350px;
}
.menu li { list-style: none; }
.menu li a {
  display: table;
  margin-top: 1px;
  padding: 14px 10px;
  width: 100%;
   text-decoration: none;
  text-align: left;
  vertical-align: middle;
  color: #fff;
  overflow: hidden;
  -webkit-transition-property: background;
  -webkit-transition-duration: 0.4s;
  -webkit-transition-timing-function: ease-out;
  transition-property: background;
  transition-duration: 0.4s;
  transition-timing-function: ease-out;
background: rgb(69,72,77); /* Old browsers */
background: -moz-linear-gradient(top, rgba(69,72,77,1) 0%, rgba(0,0,0,1) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(69,72,77,1)), color-stop(100%,rgba(0,0,0,1))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, rgba(69,72,77,1) 0%,rgba(0,0,0,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, rgba(69,72,77,1) 0%,rgba(0,0,0,1) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, rgba(69,72,77,1) 0%,rgba(0,0,0,1) 100%); /* IE10+ */
background: linear-gradient(to bottom, rgba(69,72,77,1) 0%,rgba(0,0,0,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#45484d', endColorstr='#000000',GradientType=0 ); /* IE6-9 */
}
.menu > li:first-child a { margin-top: 0; }
.menu li a:hover {
 background: rgb(125,126,125); /* Old browsers */
background: -moz-linear-gradient(top, rgba(125,126,125,1) 0%, rgba(14,14,14,1) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(125,126,125,1)), color-stop(100%,rgba(14,14,14,1))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, rgba(125,126,125,1) 0%,rgba(14,14,14,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, rgba(125,126,125,1) 0%,rgba(14,14,14,1) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, rgba(125,126,125,1) 0%,rgba(14,14,14,1) 100%); /* IE10+ */
background: linear-gradient(to bottom, rgba(125,126,125,1) 0%,rgba(14,14,14,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#7d7e7d', endColorstr='#0e0e0e',GradientType=0 ); /* IE6-9 */
  -webkit-transition-property: background;
  -webkit-transition-duration: 0.2s;
  -webkit-transition-timing-function: ease-out;
  transition-property: background;
  transition-duration: 0.2s;
  transition-timing-function: ease-out;
}
.menu li ul {
  margin: 0;
  padding: 0;
}
.menu li li a {
  display: block;
  margin-top: 0;
  padding: 0 10px;
  height: 0;
  background: #333;
  color: hotpink;
  -webkit-transition-property: all;
  -webkit-transition-duration: 0.5s;
  -webkit-transition-timing-function: ease-out;
  transition-property: all;
  transition-duration: 0.5s;
  transition-timing-function: ease-out;
}
.menu > li:hover li a {
  display: table;
  margin-top: 1px;
  padding: 10px;
  width: 100%;
  height: 1em;
  -webkit-transition-property: all;
  -webkit-transition-duration: 0.3s;
  -webkit-transition-timing-function: ease-out;
  transition-property: all;
  transition-duration: 0.3s;
  transition-timing-function: ease-out;
}
.menu > li:hover li a:hover {
  background: #222;
  -webkit-transition-property: background;
  -webkit-transition-duration: 0.2s;
  -webkit-transition-timing-function: ease-out;
  transition-property: background;
  transition-duration: 0.2s;
  transition-timing-function: ease-out;
}

Enjoy!