#ftbtn {
	display:none;
}
@media screen and (max-width: 640px) {
	#ftbtn {
		display:inline-block;
		position:fixed;
		bottom:0;
		margin-bottom:20px;
		height:80px;
		right:20px;
		z-index:9999;
	}
	.idbnr {
		display:none;
	}
}