body {
  background-image: url(img/rio_atrato.gif);
  background-position: top center;
  background-repeat: no-repeat;
  background-attachment: scroll;
  background-size: 100%;
  background-color:#d7caa8;
}

/* For mobile devices
@media only screen and (max-width: 767px) {
  body {
    background-image: url(img/rio_atrato.jpg);
  }
} */