【テスト】
body {background-image:URL("img/img.jpg");
}
.MainFrame {
text-align:center;
margin-left:auto;
margin-right:auto;
width:420px;
background-color:#FFFFFF;
}
#fadeLayer {
position:absolute;
top:0px;
left:0px;
width:100%;
height:100%;
background-color:#000000;
opacity:0.5;
visibility:hidden;
z-index:1;
}