如果动态图像与javascript垂直，则尝试居中

<div style="display: flex; justify-content: center; align-items: center;">
  <img src="dynamic_image.gif" alt="Dynamic Image">
</div>

<div style="position: relative;">
  <img src="dynamic_image.gif" alt="Dynamic Image" style="position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);">
</div>

<div id="container">
  <img src="dynamic_image.gif" alt="Dynamic Image">
</div>

<script>
  var container = document.getElementById("container");
  var image = container.querySelector("img");
  var containerWidth = container.offsetWidth;
  var containerHeight = container.offsetHeight;
  var imageWidth = image.offsetWidth;
  var imageHeight = image.offsetHeight;

  var left = (containerWidth - imageWidth) / 2;
  var top = (containerHeight - imageHeight) / 2;

  image.style.position = "absolute";
  image.style.left = left + "px";
  image.style.top = top + "px";
</script>