pre{background:#666; color:#fff; padding:10px; margin-top:10px; height:auto; overflow:auto}
* html pre {width:100%}
.viewer{padding:0 auto; margin:0 auto; border:0px}

#box1{
	position:absolute;
}

.mask{
	position:relative;
	width:886px;
	height:370px;
	overflow:hidden;
	padding: 10px;
}
.mask img{
	position:absolute;
	display:block;
	border:none;
}