请问如何让logo区域正常显示

用的是2.2.8版本，官网抄下来的示例代码

从控制台可以看到logo的div没有高度，
且宽度为100%网页尺寸，
相关css样式缺失，
下面是我的和官网示例对比，

图片描述

main.ts已全局引入ant-design-vue和css

import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
import Antd from 'ant-design-vue';
import 'ant-design-vue/dist/antd.css';

createApp(App).use(store).use(router).use(Antd).mount('#app')

app.vue

<template>
  <a-layout>
    <a-layout-header class="header">
      <div class="logo" />
      <a-menu
          theme="dark"
          mode="horizontal"
          v-model:selectedKeys="selectedKeys1"
          :style="{ lineHeight: '64px' }"
      >
        <a-menu-item key="1">nav 1111</a-menu-item>
        <a-menu-item key="2">nav 2</a-menu-item>
        <a-menu-item key="3">nav 3</a-menu-item>
      </a-menu>
    </a-layout-header>
    <a-layout>
      <a-layout-sider width="200" style="background: #fff">
        <a-menu
            mode="inline"
            v-model:selectedKeys="selectedKeys2"
            v-model:openKeys="openKeys"
            :style="{ height: '100%', borderRight: 0 }"
        >
          <a-sub-menu key="sub1">
            <template #title>
                <span>
                  <user-outlined />
                  subnav 1
                </span>
            </template>
            <a-menu-item key="1">option1</a-menu-item>
            <a-menu-item key="2">option2</a-menu-item>
            <a-menu-item key="3">option3</a-menu-item>
            <a-menu-item key="4">option4</a-menu-item>
          </a-sub-menu>
          <a-sub-menu key="sub2">
            <template #title>
                <span>
                  <laptop-outlined />
                  subnav 2
                </span>
            </template>
            <a-menu-item key="5">option5</a-menu-item>
            <a-menu-item key="6">option6</a-menu-item>
            <a-menu-item key="7">option7</a-menu-item>
            <a-menu-item key="8">option8</a-menu-item>
          </a-sub-menu>
          <a-sub-menu key="sub3">
            <template #title>
                <span>
                  <notification-outlined />
                  subnav 3
                </span>
            </template>
            <a-menu-item key="9">option9</a-menu-item>
            <a-menu-item key="10">option10</a-menu-item>
            <a-menu-item key="11">option11</a-menu-item>
            <a-menu-item key="12">option12</a-menu-item>
          </a-sub-menu>
        </a-menu>
      </a-layout-sider>
      <a-layout-content
          :style="{ background: '#fff', padding: '24px', margin: 0, minHeight: '280px' }"
      >
        Content
      </a-layout-content>
    </a-layout>
    <a-layout-footer style="text-align: center">
      Ant Design ©2018 Created by Ant UED
    </a-layout-footer>
  </a-layout>
</template>

<style>
  #components-layout-demo-top-side-2 .logo {
    float: left;
    width: 120px;
    height: 31px;
    margin: 16px 24px 16px 0;
    background: rgba(255, 255, 255, 0.3);
  }

  .ant-row-rtl #components-layout-demo-top-side-2 .logo {
    float: right;
    margin: 16px 0 16px 24px;
  }

  .site-layout-background {
    background: #fff;
}</style>