Put a div on bottom of the screen, not page

Question

I am trying to put a gray bar on the bottom of the screen of my webpage, regardless of the resolution. However, when I try, it seems to just go up or down when I go in a different resolution. Is there any way to fix this?

Also, the bar is made out of CSS using the div id tag.

/* HTML*/
<div id="info">Scroll for info</div>

/* CSS */
<style>
#info { 
    height: 40px; 
    position: relative; 
    margin-top: 25%; 
    background-color: #393838; 
    opacity: 
}
</style>

EDIT: I want it to be on the bottom of the screen, but then when I scroll down it goes up towards the top of my screen.

Answer 1

If you want it on the bottom and always at the bottom, you have to use position: fixed. You could try this:

#info { 
    height: 40px; 
    position: fixed; 
    bottom:0%;
    width:100%; 
    background-color: #393838; 
    opacity: 1;
}

http://jsfiddle.net/rX4nd/1/