如何在响应式视频元素上居中播放按钮

.video-container {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%; /* 16:9 比例的视频容器 */
}

.video-container video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

<div class="video-container">
  <video id="my-video" src="video.mp4"></video>
  <button class="play-button" onclick="toggleVideo()">播放</button>
</div>

<script>
function toggleVideo() {
  var video = document.getElementById("my-video");
  if (video.paused) {
    video.play();
  } else {
    video.pause();
  }
}
</script>