HTML、CSS、jQueryを使用してレスポンシブビデオプレーヤーを作成する方法

<div class="video-player">
  <video id="my-video" controls>
    <source src="video.mp4" type="video/mp4">
    Your browser does not support the video tag.
  </video>
  <div class="controls">
    <button class="play-pause"></button>
    <div class="progress-bar">
      <div class="progress"></div>
    </div>
    <div class="volume-bar">
      <div class="volume"></div>
    </div>
  </div>
</div>

.video-player {
  position: relative;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

.video-player video {
  width: 100%;
  height: auto;
}

.controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(0, 0, 0, 0.4);
  display: flex;
  justify-content: space-between;
  padding: 5px;
}

.play-pause {
  background-image: url(play-pause.png);
  background-size: cover;
  width: 30px;
  height: 30px;
  cursor: pointer;
}

.progress-bar {
  flex-grow: 1;
  height: 5px;
  background-color: #fff;
  margin: 10px;
}

.progress {
  height: 100%;
  background-color: #ff0000;
  width: 0;
}

.volume-bar {
  flex-grow: 1;
  height: 5px;
  background-color: #fff;
  margin: 10px;
}

.volume {
  height: 100%;
  background-color: #ff0000;
  width: 50%;
}

$(document).ready(function() {
  var video = $("#my-video")[0];
  var playPauseBtn = $(".play-pause");
  var progressBar = $(".progress");
  var volumeBar = $(".volume");

  playPauseBtn.on("click", function() {
    if (video.paused) {
      video.play();
      playPauseBtn.css("background-image", "url(pause.png)");
    } else {
      video.pause();
      playPauseBtn.css("background-image", "url(play.png)");
    }
  });

  video.addEventListener("timeupdate", function() {
    var progress = video.currentTime / video.duration * 100;
    progressBar.width(progress + "%");
  });

  volumeBar.on("click", function(event) {
    var volume = event.offsetX / volumeBar.width();
    video.volume = volume;
    volumeBar.width(volume * 100 + "%");
  });
});