@charset "utf-8";
body, html{
	width: 100%;
	height: 100%;
	position: relative;
	min-height: 100%;
	background-image: url(../images/bk_image.png) ;
	background-size: cover;
	background-attachment: fixed;
	background-repeat: no-repeat;
	background-position: center center;
}
@media screen and (max-device-width: 779px){
  body:before{
  width: 100%;
  height: 100%;
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  background:url(../images/bk_image.png) no-repeat center center;
  background-size: cover;
  background-image: #000;
  content: "";
  z-index: -1;
 }
}