html,body {
	height: 100%;
}


* html .layer_board_bg,
* html .layer_board {
	position: absolute;
}

.layer_board_bg {
	position: fixed;
	width: 100%;
	height: 100%;

	z-index: 1000;

	top: 0;
	left: 0;

	display: none;
	cursor: pointer;
	background: #000;
}

.layer_board {
	display: none;
	position: fixed;
	/*left: 25%;*/

	text-align: center;
	z-index: 2000;
	top: 50%;
  left: 50%;
  transform: translateY(-50%) translateX(-50%);
  -webkit- transform: translateY(-50%) translateX(-50%);
}

.attention{
  font-size: 15px;
  background-color: rgba(255,255,255,0.9);
  width: 100%;
  height: 400px;
  border-radius: 10px;
  overflow-y: scroll;
  padding: 20px;
  margin: 10% auto;
}
.layer_board_bg{
  text-align: center;
}
.layer_board{
  margin: 0 auto;
}

.btn_close {
    display: block;
    -webkit-margin-before: 1em;
    -webkit-margin-after: 1em;
    -webkit-margin-start: 0px;
    -webkit-margin-end: 0px;
}