span {
display:block;
font-size:0;
z-index: 1
}

span#bordaum {
width: 6px;
height: 6px;
background: url(http://plife.zinebr.org/bordas.gif);
background-position: 0 0;
float: left
}

span#bordadois {
width: 6px;
height: 6px;
background: url(http://plife.zinebr.org/bordas.gif);
background-position: 0 18px;
float: right
}

span#bordatres {
width: 6px;
height: 6px;
background: url(http://plife.zinebr.org/bordas.gif);
background-position: 0 12px;
margin: 407px 0 0 -6px;
float: left;
}

span#bordaquatro {
width: 6px;
height: 6px;
background: url(http://plife.zinebr.org/bordas.gif);
background-position: 0 6px;
margin: 407px -6px 0 0;
float: right
}