Check out example codes for "center a video horizontally". It will help you in understanding the concepts better.

Code Example 1

<div class="videoDiv">
  <video width="100%" controls>
    <source src="" type="video/mp4">
    <source src="" type="video/ogg">
  Your browser does not support the video tag.

Code Example 2

/*option 1:this makes the video responsive*/
    width: 70%; /*or whatever % you prefer*/
    margin: 0 auto;
    display: block;

/* option 2* does not make the video responsive*/

  margin:0 auto;
  display: block;

Learn ReactJs, React Native from