[peace19812006]

I am trying to use the image as background for the book. I use CSS like this:
div.img {
background-image: url(../images/4444.jpg);
background-repeat: no-repeat;
background-position: center;
background-size: cover;
}
However, the image cannot be stretched full width. See the picture below. I don't want to see white color in this image. How can I fix that? Thanks!