body {
  text-align: center;
 }

#page-wrap {
  text-align: left;
  width: 800px;
  margin: 0 auto;
}
body.gallery #content, body.listing #content, body.content #content {
    width: 78%;
    max-width: 78%;
}
#full_screen_image {
    background-position: 46%;
}

@media only screen and (max-width: 767px) {
  body.gallery #content, body.listing #content, body.content #content {
    width: 100%;
    max-width: 100%;
    padding: 0 10px;
    margin: 2px!important;
    float: none;
  }
}