.mask{
	position:fixed;
	/*left: 44%;*/
	top: 40%;
	left: 50%;
	transform: translate(-50%,-50%);
	-webkit-transform: translate(-50%,-50%);
	-o-transform: translate(-50%,-50%);
	-moz-transform: translate(-50%,-50%);
	-ms-transform: translate(-50%,-50%);
	display: none;
	/*top: 300px;*/
	padding: 24px 32px;
	box-sizing:border-box;
	background:rgba(0,0,0,0.6);
	border-radius:10px;
	font-size:18px;
	color:rgba(255,255,255,1);
	z-index: 1000;
}