Post divider line spacing?

I was able to get a post divider on my blog (which is not published yet) through research on this forum, but now I can't get any space added before the divider - ie it is too close to the footer info. Here is what I have:

div.post-footer {
clear:both;
display: block;
/* more ... */
margin-bottom: 20px;
padding-bottom: 10px;
border-bottom: dotted 1px #cccccc;

}

div.post-footer a:link,
div.post-footer a:visited,
div.post-footer a:active {
/* more ... */

}

div.post-footer a:hover {
/* more ... */
}

and changing the margin and padding doesn't work. Thoughts? Thanks in advance.