CSS - Footer

So I have this footer, and it seems to work. I just want some critiques or pointers as to if this is crappy coding, what I could change to do better… etc.

It’s a browser wide footer, w/ some links. Designed to sit at the bottom of the page. 40px high.

here is the css.

#footer {

position: absolute;
height: 40px;
width: 100%;
overflow: hidden;
margin: 0;
padding: 0;
background: #a7e24b;
bottom: auto;
left: 0;
z-index: 200;

}

Thanks.