How to add images in general

I just want to be able to add a lot of extraneous images all over the place in my sub... but I can't seem to add more than one. The one that does work is like this:

img {
    content: url(%%textbig%%);
    position: absolute;
    top: 131px;
    right: 337px;
    width: 676px;
    height: 425px;
    }

...but I don't know how to add any more. When I try using "img {" for another one, it messes up the first image. How can I continue to add image after image without them interfering with each other?

(PS: preferable copy and paste whatever I have to do in one big chunk... I'm new to CSS, and the easier you make it, the better).