img.prohintergrund {
  border:0 !important;
  overflow:none;
  background-repeat:no-repeat;
  background-position:0% 0%;
  pointer-events: none;
  min-width:24px;
  min-height:24px;
  width:24px;
  height:24px;
  max-width:24px;
  max-height:24px;
  user-drag: none; 
  -webkit-touch-callout: none;
 -webkit-user-select: none;
 -khtml-user-select: none;
 -moz-user-select: none;
 -ms-user-select: none;
 user-select: none; 
}

img.prohintergrund.astronomie {
  background-image:url('data:image/svg+xml;base64,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');
}

img.prohintergrund.geographie {
  background-image:url('data:image/svg+xml;base64,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');
}