How to create a simple HTML page with a horizontally and vertically centered image

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Originally coming from the world of HTML and web-publishing, it's been a while since I actually needed to do a HTML page. For a quick project I wanted to create a very simple page, just showing a centered image in the middle of the page.

Of course the "<center>" tag is still present in my head (once you ride a bicycle...), but this only centers the image (or text, or whatever is embedded within the <center> tag) horizontally, not vertically. Depending on screen size, this can look weird.

In the past I would've probably used a stretched table, spanning 100% in width and height, however there's a much better solution.

The following CSS can be used to center any image on the page:

$ cat css.css
img {
    position: absolute;
    margin: auto;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;

The full HTML of the index page (which uses the previous css):

# cat index.html
<!DOCTYPE html>
<html lang="en">
<title>PDF Download</title>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta http-equiv="content-language" content="en">
<link href="/css.css" rel="stylesheet">
<meta name="theme-color" content="#ffffff">
<a href="document.pdf" target="_blank"><img src="pdf.png"></a>

The resulting page shows the image centered in the browser window:

HTML centered (both vertically and horizontally) image

Even after a browser resize (larger window), the image remains centered:

Note: The size of the image is not automatically scaled. That would be another task.

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