Vue3引用Element-plus轮播图出现错误

轮播图格式不对，问题到底在哪？

官网引用的源码：

<script setup>
import { ElCarousel, ElCarouselItem } from "element-plus";
script>

<template>
  <div class="block text-center">
    <span class="demonstration"
      >Switch when indicator is hovered (default)
    <el-carousel height="150px">
      <el-carousel-item v-for="item in 4" :key="item">
        <h3 class="small justify-center" text="2xl">{{ item }}h3>
      el-carousel-item>
    el-carousel>
  div>
  <div class="block text-center" m="t-4">
    <span class="demonstration">Switch when indicator is clickedspan>
    <el-carousel trigger="click" height="150px">
      <el-carousel-item v-for="item in 4" :key="item">
        <h3 class="small justify-center" text="2xl">{{ item }}h3>
      el-carousel-item>
    el-carousel>
  div>
template>

<style scoped>
.demonstration {
  color: var(--el-text-color-secondary);
}

.el-carousel__item h3 {
  color: #475669;
  opacity: 0.75;
  line-height: 150px;
  margin: 0;
  text-align: center;
}

.el-carousel__item:nth-child(2n) {
  background-color: #99a9bf;
}

.el-carousel__item:nth-child(2n + 1) {
  background-color: #d3dce6;
}
style>

引入组件后，有没有注册呢

export default {
    components: { ElCarousel, ElCarouselItem },
  }

需要看一下 F12 控制台信息，才好去排查

看着像样式没生效？