body { 
  background: url(../img/background.png) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

.presentor{
	background-color: rgba(255,255,255,0.72);
	-webkit-border-radius: 4px;
	-moz-border-radius: 4px;
	border-radius: 4px;
	margin-top: 20%;
	padding:5px;
}

.presentIMG{
	margin-top:10%;
}
.sidr{
	margin-top: 54%;
}