cmq il css è questo...

.transparent {
filter:alpha(opacity=80);
opacity: 0.6;
background-color:#00C100;
display:none;
width:500px;
height:100px;
position:absolute;
color: white;
border-top: 1px #000000 dotted;
border-bottom: 1px #000000 dotted;
font-family: verdana;
font-size: 14px;
font-weight: bold;
z-index: 10000;
text-align: center;
vertical-align: middle;

}