html {
  background-color: #000;
  background-image: none;
}

body {
  background: transparent url(http://assets.ngin.com/site_files/1261/background.jpg) top center no-repeat;
}

body.noUserBar {
  background: transparent url(http://assets.ngin.com/site_files/1261/backgroundNoUser.jpg) top center no-repeat;
}

body#survey_steps {
  background: transparent url(http://assets.ngin.com/site_files/1261/registrationBackground.jpg) top center no-repeat;
}