如何使用flexbox在下拉菜单中定位子菜单

<div class="dropdown">
  <button class="dropbtn">下拉菜单</button>
  <div class="dropdown-content">
    <a href="#">子菜单1</a>
    <a href="#">子菜单2</a>
    <a href="#">子菜单3</a>
  </div>
</div>

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

.dropdown-content {
  display: none;
  position: absolute;
  flex-direction: column;
}

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

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  background-color: #f9f9f9;
}

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