注册页面垂直居中
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<meta charset="utf-8" />
<link href="Content/bootstrap.min.css" rel="stylesheet" />
<style>
.center{
height:300px;
position:absolute;
top:0;
left:0;
bottom:0;
right:0;
margin:auto;
}
</style>
</head>
<body>
<form>
<div class="container-fluid">
<div class="col-md-3 col-md-offset-4 center">
<fieldset>
<legend>用户注册</legend>
<div class="form-group">
<label for="exampleInputEmail1">邮箱</label>
<input type="email" class="form-control" id="exampleInputEmail1" placeholder="请输入邮箱地址">
</div>
<div class="form-group">
<label for="exampleInputPassword1">密码</label>
<input type="password" class="form-control" id="exampleInputPassword1" placeholder="请输入密码">
</div>
<div class="checkbox">
<label>
<input type="checkbox"> 记住我
</label>
</div>
<button type="submit" class="btn btn-default">注册</button>
</fieldset>
</div>
</div>
</form>
</body>
</html>
