下拉列表框没有在搜索框下面，而是在页面的底部，这是为什么呢，要怎么解决这个问题？
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge" charset="UTF-8">
<title>bing search</title>
<link rel="stylesheet" type="text/css" href="test.css">
</head>
<body>
<div class="bg">
<div class="search-box">
<div class="logo"></div>
<form class="search-form" id="search-form" action="https://cn.bing.com/search" target="_blank">
<input type="text" class="search-input-text" name="q" id="search-input" autocomplete="off"/>
<input type="submit" value="" class="search-input-button"/>
</form>
</div>
</div>
<div class="suggest" id="search-suggest" style="display:none">
<ul>
<li>手机</li>
<li>手机游戏</li>
<li>手机APP</li>
<li>手机铃声</li>
<li>手机主题</li>
</ul>
</div>
<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script type="text/javascript">
$('#search-input').bind('keyup',function(){
$('#search-suggest').show().css({
top:$('#search-form').offset().top+('#search-form').height,
left:$('#search-form').offset().left,
position:'absolute'
});
})
</script>
</body>
</html>
body{
background:#333;
}
.bg{
background:url(image/river.jpg)no-repeat center center;
width:100%;
height:768px;
position:relative;
}
.logo{
background:url(image/logo.png);
width:107px;
height:53px;
margin-left:100px;
margin-bottom:40px;
}
.search-input-text{
border:0;
float:left;
height:27px;
width:350px;
line-height:27px;
outline:none;
}
.search-input-button{
border:0;/*去掉边框的颜色*/
background:url(image/search-button.png);
width:29px;
height:29px;
float:left;
}
.form{
float:left;
padding:5px;
background-color:#fff;
}
.search-box{
position:absolute;
top:200px;
left:400px;
}
.search-form{
width:388px;
height:39px;
}
.suggest{
width:388px;
background-color:#fff;
border:1px solid #999;
}
.suggest ul{
list-style:none;
margin:0;
padding:0;
}
.suggest ul li{
margin:8px;
font-size:14px;
line-height:25px;
cursor:pointer;
}
.suggest ul li:hover{
text-decoration:underline;
background-color:#e5e5e5;
}
