The following is what I have gotten from the discussions here. From your first post, you cover is probably done like this already.
Code:
<svg xmlns="http://www.w3.org/2000/svg" height="100%" preserveAspectRatio="xMidYMid meet" version="1.1" viewBox="0 0 329 500" width="100%" xmlns:xlink="http://www.w3.org/1999/xlink">
<image height="500" width="329" xlink:href="../Images/cover.jpeg"></image>
</svg>
The height and lengths are the dimensions of the image.