.parallax01 {
background-attachment: scroll; 
background-position-x: center; 
background-position-y: center;} 
.parallax02 {
background-attachment: scroll; 
background-position-x: center; 
background-position-y: center;} 
.parallax03 {
background-attachment: scroll; 
background-position-x: center; 
background-position-y: center;}