为什么在360浏览器设置浮动后会撑开？
<!DOCTYPE html>
<html>
<head>
<title>Bing search</title>
<style type="text/css">
body{
background-color: #333;
}
.bg-div{
background-image: url(Images/river.jpg);width: 1366px;height: 768px;margin: 0 auto}
.logo{
background-image: url(Images/logo.png);width: 107px;height: 53px;float:left;
}
form{
float:left;background-color: #fff;
}
</style>
</head>
<body>
<div class="bg-div">
<div class="logo"></div>
<form>
<input type="text"/>
<input type="submit"/>
</form>
</div>
</body>
</html>
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