html{width:100%;height: 100%;}
body{
	width:100%;
	height: 100%;
	padding: 0;
	margin: 0;
	position: relative;
    font-family: "times new roman";
    font-size: 16px;
    color: #fff;
}
.logo{
	position: absolute;
    width: 300px;
	left: 0;
	right: 0;
	top: 45%;
    margin: auto;
    text-align: center;
	transform: translateY(-50%);
}
.BG_img{display:block;width: 100%;height: 100%;}