*{
	margin: 0 ;padding: 0;
}
body,html{
	height: 100%;width: 100%;
}
video{
height: 100%;
width: 100%;
}
#fanhui{
	position: absolute;height:20px;width:20px;
	position: fixed;top: 8px;left: 15px;
	background-image:url(../img/fanhui_a.png) ;
	background-size:100% 100% ;z-index: 999;
}