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">
<head>
<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">
</head>
<body>
<a href="document.pdf" target="_blank"><img src="pdf.png"></a>
</body>
</html>
The resulting page shows the image centered in the browser window:
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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