Bootstrap模态框修改出现的位置和大小

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"> 
    <title>Bootstrap 实例 - 模态框(Modal)插件事件</title>
    <link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">
    <script src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script>
    <script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>

<!--修改模态框 出现的位置-->
<style type="text/css">
    .modal.fade.in{
        top:90px;  
    }
</style>

<body>

<h2>模态框(Modal)插件事件</h2>
<!-- 按钮触发模态框 -->
<button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
    开始演示模态框
</button>


<!-- 模态框(Modal) -->
<div class="modal fade"  tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
    <div class="modal-dialog" >
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×
                </button>
                <h4 class="modal-title" >
                    模态框(Modal)标题
                </h4>
            </div>
            <div class="modal-body">
                点击关闭按钮检查事件功能。
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">
                    关闭
                </button>
                <button type="button" class="btn btn-primary">
                    提交更改
                </button>
            </div>
        </div><!-- /.modal-content -->
    </div><!-- /.modal-dialog -->
</div><!-- /.modal -->
<script>
   $(function () { $(\'#myModal\').modal(\'hide\')});
</script>
<script>
   $(function () { $(\'#myModal\').on(\'hide.bs.modal\', function () {
      //alert(\'嘿,我听说您喜欢模态框...\');})
   });
</script>

</body>
</html>