How can I make the video span the entire Iframe?

Question

css

How to make the player be right on the borders of the iframe (black background)?

<style>
*{margin:0;padding:0;}
iframe {border:0}
.iframebox {
    width: 500px;
    height: 500px;
}
</style>
<iframe class="iframebox" width="200" height="700" src="20151017_093554.mp4">
</iframe>

Answer 1

1. Where did you see the body being inside the head?
"iframe html head body video"
2. put it here

<iframe class="iframebox" width="200" height="700" src="20151017_093554.mp4">

width to height: width="500" height="500"
3. Now you set different widths in 3(!!!) places, why?
4. Why duplicate your own questions ?