body {
  background-image: url(images/prodent-dental.jpg);
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
  background-color:#464646;
}

/* For mobile devices */
@media only screen and (max-width: 767px) {
  body {
    background-image: url(images/prodent-mobile.jpg);
  }
  img {
	width: 100%;
	max-width: 200px;
	display: block;
	margin-left: auto;
	margin-right: auto;

}
	}