html{
	height:100%;
	width:100%;
	overflow:hidden;
	margin:auto;
	display:block;
	padding:0px;
}
body{
	height:100%;
	width:100%;
	overflow:hidden;
	margin:auto;
	display:block;
	padding:0px;
}
.bt_edit{
	display: none;
	width: auto;
	height: auto;
	line-height: 1.2;
	background-color: #f00;
	position:absolute;
	left: 0px;
	top:0px;
	padding:10px;
	cursor: pointer;
	color: #fff;
	font-size: 12px;
	border: 1px solid #fff;
}