body {font-family:"Lucida Grande", "Lucida Sans Unicode", Verdana, Arial, Helvetica, sans-serif;font-size:1em;}
a {text-decoration:none;}
.top ul.nav {
    height:30px;
    border-top:5px solid #468b17;
    background: #a6c47b; /* Old browsers */
    background: -moz-linear-gradient(top, #a6c47b 1%, #468b17 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(1%,#a6c47b), color-stop(100%,#468b17)); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, #a6c47b 1%,#468b17 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, #a6c47b 1%,#468b17 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top, #a6c47b 1%,#468b17 100%); /* IE10+ */
    background: linear-gradient(top, #a6c47b 1%,#468b17 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#a6c47b', endColorstr='#468b17',GradientType=0 ); /* IE6-8 */
    box-shadow:-2px 2px 5px rgba(0,0,0,0.7);
}
.top ul.nav li {list-style:none;float:left;text-align:center;}
.top ul.nav li a {
    color:#fff;
    font-size:0.8em;
    padding:5px 15px;
    display:block;
    height:20px;
    border-right:1px solid rgba(70,139,23,0.5);
}
.top ul.nav li a:hover {
    color:#fff;
    background: #468b17; /* Old browsers */
    background: -moz-linear-gradient(top, #468b17 0%, #173000 99%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#468b17), color-stop(99%,#173000)); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, #468b17 0%,#173000 99%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, #468b17 0%,#173000 99%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top, #468b17 0%,#173000 99%); /* IE10+ */
    background: linear-gradient(top, #468b17 0%,#173000 99%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#468b17', endColorstr='#173000',GradientType=0 ); /* IE6-8 */
}

<div class="top">
  <ul class="nav">
    <li><a href="#">Home</a></li>
    <li><a href="#">Messages</a></li>
    <li><a href="#">Profile</a></li>
    <li><a href="#">Preferences</a></li>
    <li><a href="#">Administration</a></li>
    <li><a href="#">Storage</a></li>
    <li><a href="#">Reports</a></li>
  </ul>
</div>