html,body{margin:0;height:100%;overflow:hidden;background:#000;font-family:Arial}
.bg{
position:fixed;inset:0;
background:url('cotton-background.png') center/cover no-repeat;
}
.notice{
position:relative;
z-index:2;
margin:40px;
padding:20px;
background:rgba(0,0,0,.55);
color:white;
border-radius:12px;
}