Yeah you cannot select <select> elements as @ThiefMaster said. But you can always create a unordered list to create a dropdown(or even divs). I usually make with <ul>s and animate using jQuery or CSS transitions.
I have created a example dropdown. code is below or visit JS Fiddle. click here.
Or following is the code.
HTML
<ul>
<li><a href="#">About</a>
<ul>
<li><a href="#">History</a></li>
<li><a href="#">Team</a></li>
<li><a href="#">Offices</a></li>
</ul>
</li>
CSS
ul li{width: 100px;}
ul li a{
background: red;
padding: 5px;
display: block;
border-bottom: 1px solid black;
}
ul li ul li:first-child a{
color: white;
}
ul li ul li{
height: 0;
}
ul li:hover ul li{height: 100%;}