如何将包含不同大小图像的响应式li大小比率设置为2:1？

<ul class="image-list">
  <li>
    <div class="image-container" style="background-image: url('image1.jpg');"></div>
  </li>
  <li>
    <div class="image-container" style="background-image: url('image2.jpg');"></div>
  </li>
  <li>
    <div class="image-container" style="background-image: url('image3.jpg');"></div>
  </li>
</ul>

.image-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.image-list li {
  display: inline-block;
  width: 200px;
  padding-bottom: 100px; /* 2:1 ratio */
}

.image-container {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
}