In order to make your HTML5 video responsive you will need to add the following CSS style properties: width: 100%, and max-height: 100%.
1 2 3 | <video style="width: 100%; max-height: 100%;" autoplay="autoplay" width="300" height="150"> <source src="https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" type="video/mp4" /> Your browser does not support the video tag.</video> |