.mensaje{
position:absolute; 
background-color:#B8CCE4; 
border-left: 1px solid #009900;
border-top: 1px solid #009900;
border-right: 2px solid blue; 
border-bottom: 2px solid blue;
left:200px; top:100px; 
width:320px; 
padding-bottom:20px; 
padding-top:20px; 
z-index:10
}
.mensaje p{
font-family:Arial, Helvetica, sans-serif;
font-size:14px;
text-align:center;
color:#000000;
}
.botonmensaje{
text-align:center;
float:right;
padding-right: 10px;
}