@namespace url(http://www.w3.org/1999/xhtml);

/* based on http://userstyles.org/styles/220 */

html > body > img:only-child {
  display:block !important;
  margin:0 auto !important;
  background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYAQMAAADaua+7AAAABlBMVEX////r6+t6J/3oAAAAHElEQVR4XpXDwQAAAADCwBnkb5lBMexxkCkrxgG8yyPdm3kCiQAAAABJRU5ErkJggg==) !important;
  background-attachment:fixed !important;
}
html > body:first-child {
  background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYAQMAAADaua+7AAAABlBMVEX////M5MxltwQpAAAAHElEQVR4XpXDwQAAAADCwBnkb5lBMexxkCkrxgG8yyPdm3kCiQAAAABJRU5ErkJggg==);
  background-attachment:fixed;
}