如何使下拉菜单工作，而不使下面的内容在点击时向下移动

<div class="dropdown">
  <button class="dropdown-btn">点击显示菜单</button>
  <div class="dropdown-content">
    <a href="#">链接1</a>
    <a href="#">链接2</a>
    <a href="#">链接3</a>
  </div>
</div>
<div class="content">
  这里是下面的内容，点击下拉菜单时不会移动。
</div>

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

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-content a:hover {
  background-color: #f1f1f1;
}

.content {
  margin-top: 50px; /* 确保内容与下拉菜单之间有足够的空间 */
}

document.addEventListener('DOMContentLoaded', function() {
  const dropdownBtn = document.querySelector('.dropdown-btn');
  const dropdownContent = document.querySelector('.dropdown-content');

  dropdownBtn.addEventListener('click', function(event) {
    event.stopPropagation(); // 阻止事件冒泡
    dropdownContent.style.display = dropdownContent.style.display === 'block' ? 'none' : 'block';
  });

  document.addEventListener('click', function() {
    dropdownContent.style.display = 'none'; // 点击页面其他地方隐藏下拉菜单
  });
});