Elementplus淡入淡出效果，头部顶栏如何设置文字隐藏效果,默认图标如何收缩,icons如何通过类进行替换，侧边栏如何添加阴影，右边如何设置高度，侧边栏如何设置阴影，如何让icon与文字

.logo-title {
  margin-left: 5px;
  font-size: 20px;
  transition: all .3s;  
}

<el-icon style="width: 26px;" @click="handleCollapse"><Fold /></el-icon>
<script setup>
import {
    Fold
} from '@element-plus/icons-vue'
 
 
</script>

<el-breadcrumb separator="/">
    <el-breadcrumb-item :to="{ path: '/' }">homepage</el-breadcrumb-item>
    <el-breadcrumb-item
      ><a href="/">promotion management</a></el-breadcrumb-item
    >
    <el-breadcrumb-item>promotion list</el-breadcrumb-item>
    <el-breadcrumb-item>promotion detail</el-breadcrumb-item>
  </el-breadcrumb>

.el-aside {
  transition: width .3s;
  box-shadow: 2px 0 6px rgba(0,21,41,.35);
}

.el-header {
  box-shadow: 2px 0 6px rgba(0,21,41,.35);
}

.el-aside div span {
  font-size: 14px;
  font-family: "Times New Roman", Times, serif;
  font-weight: 700;
}