*, *:before, *:after {
	-webkit-box-sizing:inherit;
	-moz-box-sizing:inherit;
	box-sizing:inherit;
}
html {
	-webkit-box-sizing:border-box;
	-moz-box-sizing:border-box;
	box-sizing:border-box;
	-webkit-tap-highlight-color:rgba(0,0,0,0);
	-webkit-text-size-adjust:100%;
	-ms-text-size-adjust:100%;
	font-size:10px;
	line-height: 1.5;
}
body {
	font-family:"Helvetica Neue",Helvetica,"Hiragino Sans GB","Microsoft YaHei","微软雅黑",Arial,sans-serif;
	margin:0;
	color:#333;
	font-size:14px;
	overflow:hidden;
}
#wrapper {
	position:relative;
}
#background, #checkerboard {
	position:absolute;
	left:50%;
	transform:translate(-50%);
}