body {
  background-color: #FFF;
  margin-left: auto;
  margin-right: auto;
  margin-top: 10px;
  padding:0px;
  margin:0px;
  text-align: center;
}

#_box {
  width: 902px;
  height: 902px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 10px;
  font-family:Helvetica, Arial, sans-serif;
  font-size:100%; 
  font-weight:bold;
  text-align:center;
  text-decoration:none;
  color:#000;

}

#box{
  margin-left: auto;
  margin-right: auto;
  background-color: red;
}

#pfeilli{
	position:relative;
	width: 50px;
	height: 50px;
	background-image: url(pfeilli.png);
	background-repeat: no-repeat;
	left: 0px;
	z-index: 2
}

#pfeilre{
	position:relative;
	width: 50px;
	height: 50px;
	background-image: url(pfeilre.png);
	background-repeat: no-repeat;
	right: 0px;
	z-index: 3
}

img {
	position:relative;
	border: dashed 1px #000000;
	margin-left: auto;
	margin-right: auto;
	margin-top: 10px;
	z-index: 1
}

iframe { 
	display:block; width:100%; border:none; 
}