Código CSS:
Ver originalbody {
width: 100%;
height: auto; // si quieres crear scroll
margin: 0px;
padding: 0px;
}
html {
width: 100%;
height: auto; // si quieres crear scroll
margin: 0px;
padding: 0px;
}
#contenedor {
position: relative;
margin: 0px;
padding: 0px;
width: 100%;
height: 100%;
top: 0px;
left: 0px;
}
#conte-medio{
width:980px;
height:100px;
background-color: #000;
opacity:0.26;
-moz-border-radius-topleft:20px;
-moz-border-radius-topright:20px;
-moz-border-radius-bottomleft:20px;
-moz-border-radius-bottomright:20px;
position:absolute;
top: x%;
left: x%;
}
#centro-parrafo{
position:absolute;
width: x%;
height: x%;
color:white;
opacity:1.0;
top: x%;
left: x%;
}