{margin:0;padding:0;box-sizing:border-box;}
html,body {width:100%;height:100%;background-color:#000;}
#kdwn {
	position:absolute;
	top:50%;
	left:50%;
	transform:translate(-50%,-50%);
	padding:20px;
	max-width:480px;
	border-radius:10px;
}