.image-holder {
	width: 100%;
	height: 100%;
  max-width:100%;
	background-position: center center;
	background-attachment: fixed;
	background-size: cover;
}

@media only screen and (max-width : 600px) {
  .image-holder {
    background-size: contain;
    background-repeat: no-repeat;
    background-position: top center;
  }
}