如何在元素a上显示垂直滚动条并隐藏其祖先元素b的滚动条？

<main>
  <div id="b">  <!-- 祖先元素 -->
    <div id="a"> <!-- 子元素 -->
      <p>内容文本...</p>
      <p>更多内容文本...</p>
                    <div class="aritcle_card">
                        <a class="aritcle_card_img" href="/ai/854">
                            <img src="https://img.php.cn/upload/ai_manual/000/000/000/175679978251103.png" alt="腾讯元宝">
                        </a>
                        <div class="aritcle_card_info">
                            <a href="/ai/854">腾讯元宝</a>
                            <p>腾讯混元平台推出的AI助手</p>
                            <div class="">
                                <img src="/static/images/card_xiazai.png" alt="腾讯元宝">
                                <span>223</span>
                            </div>
                        </div>
                        <a href="/ai/854" class="aritcle_card_btn">
                            <span>查看详情</span>
                            <img src="/static/images/cardxiayige-3.png" alt="腾讯元宝">
                        </a>
                    </div>
                
      <!-- ...更多内容... -->
    </div>
  </div>
</main>

#a {
  max-height: 300px; /* 根据需要调整高度 */
  overflow: auto;
}

#b {
  overflow: hidden;
}