*,
*:before,
*:after {
  box-sizing: border-box;
}
body {
  padding: 1em;
  font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 15px;
  color: #b9b9b9;

  background-image:url("../assets/images/back.jpg");
  background-repeat:no-repeat;
  background-size:cover;

  /*use this to hide the scroll bar on computer*/
 /* overflow: hidden;*/
}
#gameCanvas {
	position: absolute;
	top: 50%;
	-ms-transform: translateY(-50%);
	transform: translateY(-50%);
	
}
#gameCanvas > :first-child {
	margin:auto;
  }

  .YIFRAME{
	background-color: #ffffff;
	position:absolute;
	width : 60%;
	height : 75%;
	margin-left: 20%;
	margin-right: 20%;
	margin-top: 10%;
	visibility : hidden ;
	z-index: 0;
}div.YIFRAME img.YcloseMe {
	position:absolute;
	left: 92%;
	top:6px;
	cursor: pointer;
}