<video controls>
  <source src="http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" type="video/mp4" />
</video>
video {
  width: 30rem;
}

video::-webkit-media-controls-timeline {
  background-color: #f00;
  padding-bottom: 0;
  margin-bottom: 20px;
}
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