#canvas_ausgabe {
  border-style:solid;
  border-width:1px;
  border-color:#bebebe;
  image-rendering : optimizeSpeed;
  image-rendering : crisp-edges;
  image-rendering : -moz-crisp-edges;
  image-rendering : -o-crisp-edges;
  image-rendering : -webkit-optimize-contrast;
  -ms-interpolation-mode: nearest-neighbor;
}