描述问题：

如题

截图或视频：

=576px 下的显示异常

576px以下正常显示移动样式

768px以上正常显示pc端

如何复现（请务必完整填写下面内容）：

1. 你是如何使用 amis 的？
   sdk app
2. amis 版本是什么？请先在最新 beta 版本测试问题是否存在
   v2.7.2
3. 粘贴有问题的完整 amis schema 代码：

{
            "type": "container",
            "style": {
                "textAlign": "center",
                "margin": "8px"
            },
            "body": [
                {
                    "type": "grid",
                    "className": "b-a b-light",
                    "columns": [
                        {
                            "body": [
                                {
                                    "type": "tpl",
                                    "tpl": "<a style='font-size:28px;font-weight:bold;' href='#/alert/tasks?alertStatus=1'>${AlertTaskForAlertingCount}</a><br/>告警中"
                                }
                            ],
                            "columnClassName": "b-a b-light p-b-xs"
                        },
                        {
                            "body": [
                                {
                                    "type": "tpl",
                                    "tpl": "<a style='font-size:28px;font-weight:bold;' href='#/alert/list'>${AlertCount}</a><br/>监控数"
                                }
                            ],
                            "columnClassName": "b-a b-light p-b-xs"
                        },
                        {
                            "body": [
                                {
                                    "type": "tpl",
                                    "tpl": "<a style='font-size:28px;font-weight:bold;' href='#/alert/tasks'>${AlertTaskCount}</a><br/>监控任务"
                                }
                            ],
                            "columnClassName": "b-a b-light p-b-xs"
                        },
                        {
                            "body": [
                                {
                                    "type": "tpl",
                                    "tpl": "<a style='font-size:28px;font-weight:bold;' href='#/report/list'>${ReportCount}</a><br/>报告数"
                                }
                            ],
                            "columnClassName": "b-a b-light p-b-xs"
                        },
                        {
                            "body": [
                                {
                                    "type": "tpl",
                                    "tpl": "<a style='font-size:28px;font-weight:bold;' href='#/report/tasks'>${ReportTaskCount}</a><br/>报告任务"
                                }
                            ],
                            "columnClassName": "b-a b-light p-b-xs"
                        }
                    ]
                }
            ]
        }