Using The width Property
If the width property is set to 100%, the video player will be responsive and scale up and down:
Notice that in the example above, the video player can be scaled up to be larger than its original size. A better solution, in many cases, will be to use the max-width property instead.
Using The max-width Property
If the max-width property is set to 100%, the video player will scale down if it has to, but never scale up to be larger than its original size:
Add a Video to the Example Web Page
We want to add a video in our example web page. The video will be resized to always take up all the available space: