[JSWolf]

Originally Posted by Phssthpok

This is on a Kobo, and the image is only about 200px in height.

Depending on the aspect of the image, I would make the height to 100%. For example, the cover.

I set img so it doesn't go off the screen. I don't use auto and I don't need it. It's just unneeded code.

img {
  max-height: 100%;
  max-width: 100%;
}
.height {
  text-align: center;
  text-indent: 0;
  height: 100%;
}
.width {
  text-align: center;
  text-indent: 0;
  width: 100%;
}