Simple Css3 Drop Down Navigation Bar For blog

<style>
/* The CSS Code for the menu starts here foulscode.blogspot.gr */
.btrix_menu,.btrix_menu ul,.btrix_menu li,.btrix_menu a {
 margin: 0;
 padding: 0;
 border: none;
 outline: none;
}
.btrix_menu {
 height: 40px;
 width: 525px;
 background: #4c4e5a;
 background: -webkit-linear-gradient(top, #4c4e5a 0%,#2c2d33 100%);
 background: -moz-linear-gradient(top, #4c4e5a 0%,#2c2d33 100%);
 background: -o-linear-gradient(top, #4c4e5a 0%,#2c2d33 100%);
 background: -ms-linear-gradient(top, #4c4e5a 0%,#2c2d33 100%);
 background: linear-gradient(top, #4c4e5a 0%,#2c2d33 100%);
 -webkit-border-radius: 5px;
 -moz-border-radius: 5px;
 border-radius: 5px;
}
.btrix_menu li {
 position: relative;
 list-style: none;
 float: left;
 display: block;
 height: 40px;
}
.btrix_menu li a {
 display: block;
 padding: 0 14px;
 margin: 6px 0;
 line-height: 28px;
 text-decoration: none;
 border-left: 1px solid #393942;
 border-right: 1px solid #4f5058;
 font-family: Helvetica, Arial, sans-serif;
 font-weight: bold;
 font-size: 13px;
 color: #f3f3f3;
 text-shadow: 1px 1px 1px rgba(0,0,0,.6);
 -webkit-transition: color .2s ease-in-out;
 -moz-transition: color .2s ease-in-out;
 -o-transition: color .2s ease-in-out;
 -ms-transition: color .2s ease-in-out;
 transition: color .2s ease-in-out;
}
.btrix_menu li:first-child a { border-left: none; }
.btrix_menu li:last-child a{ border-right: none; }
.btrix_menu li:hover > a { color: #8fde62; }
.btrix_menu ul {
 position: absolute;
 top: 40px;
 left: 0;
 opacity: 0;
 background: #1f2024;
 -webkit-border-radius: 0 0 5px 5px;
 -moz-border-radius: 0 0 5px 5px;
 border-radius: 0 0 5px 5px;
 -webkit-transition: opacity .25s ease .1s;
 -moz-transition: opacity .25s ease .1s;
 -o-transition: opacity .25s ease .1s;
 -ms-transition: opacity .25s ease .1s;
 transition: opacity .25s ease .1s;
}
.btrix_menu li:hover > ul { opacity: 1; }
.btrix_menu ul li {
 height: 0;
 overflow: hidden;
 padding: 0;
 -webkit-transition: height .25s ease .1s;
 -moz-transition: height .25s ease .1s;
 -o-transition: height .25s ease .1s;
 -ms-transition: height .25s ease .1s;
 transition: height .25s ease .1s;
}
.btrix_menu li:hover > ul li {
 height: 36px;
 overflow: visible;
 padding: 0;
}
.btrix_menu ul li a {
 width: 100px;
 padding: 4px 0 4px 40px;
 margin: 0;
 border: none;
 border-bottom: 1px solid #353539;
}
.btrix_menu ul li:last-child a { border: none; }
.btrix_menu a.documents { background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNbQB9oVY3tUbhsn0MQnAuP1eImN6__dqFT7qri3xxoZTpHA570yiDH2m0E9gynYhWGdN7i5fd3QioJBYKfe1mM-BCLm31A2CBlBkXLQf70gresDxLpmdwTQB7jTSYocT2M07lc2y5bfGm/s1600/docs.png) no-repeat 6px center; }
.btrix_menu a.messages { background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJ6fVBunqTwkalL1J3ceDSrESIMybpQQYgvyBtyjiY_9vPvccr1SDhiNfRxaVa9Y_TBpCzGKqUlDytLYrrbaupXuU66iAaCF0oe9AoL96PFUkZuYmwAUGDzZiiZjXpkMraVkED5TSitfEJ/s1600/bubble.png) no-repeat 6px center; }
.btrix_menu a.signout { background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg11rUJMU4MniaZxGqzXMpTCwZepMlbM1qqT3EiFPIbzz7bselyEglHXpTZ39s6fqBgHeBTaZod8eRvzjroel2i3LjSLARg94KYR4HO-_pEubQ31B2q4iF_NQWruwVljZJ7FwM98O2H1qv7/s1600/arrow.png) no-repeat 6px center; }
/* foulscode.blogspot.gr */
</style>
<ul class="btrix_menu">
 <li><a href="URL">Home</a></li> <li><a href="URL">Likes</a></li> <li><a href="URL">Views</a>
  <ul>
   <li><a href="URL" class="documents">Documents</a></li>   <li><a href="URL" class="messages">Messages</a></li>   <li><a href="URL" class="signout">Sign Out</a></li>  </ul>
 </li>
 <li><a href="URL">Uploads</a></li> <li><a href="URL">Videos</a></li>    <li><a href="URL">About</a></li> <li><a href="http://www.foulscode.blogspot.gr/">Contact us</a></li>
</ul>