html {font-family: Arial;}

#box {position: absolute; z-index: 1000; top: 0; text-align: center; width: 100%; height: 100%; font-size: 24px; background-color: rgba(0,0,0,0.6); color: #ffffff; display: none;}
#box-msg {
	position: absolute; top: 50%; width: 100%;
	-webkit-transform: translateY(-50%);
	-moz-transform: translateY(-50%);
	-o-transform: translateY(-50%);
	transform: translateY(-50%);
}