引导下拉菜单增加宽度，后跟ul/li

<div class="dropdown">
  <button class="dropbtn">菜单</button>
  <div class="dropdown-content">
    <ul>
      <li><a href="#">链接1</a></li>
      <li><a href="#">链接2</a></li>
      <li><a href="#">链接3</a></li>
    </ul>
  </div>
</div>
<ul class="follow-up-list">
  <li>后续项1</li>
  <li>后续项2</li>
  <li>后续项3</li>
</ul>

.dropdown {
  position: relative;
  display: inline-block;
}

.dropbtn {
  background-color: #4CAF50;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
  cursor: pointer;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 200px; /* 调整此值以改变下拉菜单的宽度 */
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

.dropdown-content li {
  padding: 12px 16px;
}

.dropdown-content li a {
  color: black;
  text-decoration: none;
}

.dropdown:hover .dropdown-content {
  display: block;
}

.follow-up-list {
  margin-top: 20px;
  list-style-type: none;
  padding: 0;
}

.follow-up-list li {
  background-color: #f1f1f1;
  padding: 10px;
  margin-bottom: 5px;
}