The css file is style.css and the specific bit is most likley...
.post {
margin: 0 ;
padding: 15px 15px 5px;
border-bottom:1px solid #CCC9B8;
}

Thanks.. I altered it with this one but it didnt show up the image. I think theres something wrong with it. Then I used it as background instead.. still trying to figure it out.. :)

.post {
margin: 0 ;
padding: 15px 15px 5px;
border-bottom:1px solid #CCC9B8;
background: url(http://www.nazcarpine.com/gallery/albums/userpics/10001/earphones.gif) bottom center no-repeat;
}

This works, though ypou will have to change your background colour.
.post {border:none;
margin: 0 ;
padding: 15px 15px 45px;
background: url(http://www.nazcarpine.com/gallery/albums/userpics/10001/earphones.gif) bottom center no-repeat;
}

thanks john..