html {
  	background: url(../img/bk.jpg) no-repeat center center fixed; 
  	-webkit-background-size: cover;
  	-moz-background-size: cover;
  	-o-background-size: cover;
  	background-size: cover;
	height: 100%;
	overflow: hidden;
}

body {
	height:100%;
	overflow: scroll;
	-webkit-overflow-scrolling: touch;
}

box {
	width: 51px;
}

.logo {
	display:block;
	background:url(../img/b5t.png) no-repeat center left;
	width:50px;
	height:50px;
	padding-top:18px;
	padding-left:50px;
}