格式化< li>元素在< div>

我在我的页面上有两个 li 元素，我希望他们显示一个在另一个之上，但他们没有。这是我的代码：

I have two li elements on my page and I want them to display one above the other, but they don't. Here is my code:

#floating-box {
width: 65px;
height:auto;
background-color: #484848;
margin: 54px 10px 0px 623px;
position:absolute;
z-index:1;
text-align: justify;
border-top: 1px solid #000;
border-left: 1px solid #000;
border-bottom: 1px solid #000;
border-right: 1px solid #484848;
 }
.social {
position : relative;
list-style-type : none;
margin-left: 2px;
}

.social li a {
float: left;
padding: 1px 5px 5px 0px;
margin: 0px 0px 3px 0px;
display: inline;
}

使用此CSS的HTML是：

The HTML that uses this CSS is:

<div id="floating-box">
<img src="likeusnow.jpg" />
<ul class="social"><!-- Facebook Like/Share Button -->
<li><a name="fb_share" type="box_count" rel="nofollow"          share_url="http://www.mysite.com"></a> 
 </li>

<li>
<a href="https://twitter.com/share" rel="nofollow" class="twitter-share-button" data- url="http://www.mysite.com" data-lang="en" data-count="vertical">Tweet</a>
</li>

 </ul>

Facebook喜欢按钮显示在Twitter微博按钮的顶部，或者在它的右边。

The Facebook like button either appears on top of the twitter tweet button, or to the right of it. For some reason it varies every time.