html, page {  
    height: 100vh;
    min-height: 100%;
    overflow: hidden;
	width: 100vw;
	min-width: 100%;
}

.box-cover {
  border: 0;
  position:absolute;
  top:0; left:0;
  right:0;
  bottom:0;
  background-color: #fff;
  z-index: 10000;
  overflow: hidden;
  margin: 0;
  padding: 0;
  width: 100%;
  -webkit-overflow-scrolling: touch;
  overflow-y: scroll;
}
.cover-frame {
  background-color: #fff;
  overflow: hidden;
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}

.a-button {
	padding: 10px;
  	background-color: #999;
  	color: #fff;
  	border-radius: 4px;
}