How do you center a video using CSS

Question

I want to center a video on my website, but I don't want to utilize HTML's center tags because they are kind of dated. What is the CSS code for this? If it's any assistance, this is my HTML code.

<center>
  <video width="320" height="240" controls>
    <source src="video.mp4" type="video/mp4">
    <source src="video.ogg" type="video/ogg">
    <source src="video.webm" type="video/webm">
    Your browser does not support the video tag.
  </video>
</center>