body{
    background-color: white;
    padding: 0px;
    margin: 0px;
}

iframe{
    position: absolute;
    top: 0px;
    left: 0px;
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    border: 0px none;
}

@media screen and (min-width=1900px){
  #anzeige{
    position: absolute;
    height: 780px;
    width: 1200px;
    #background-color: gray;
    #border: 1px solid yellow;
  }
}


@media screen and (max-width=1900px){
  #anzeige{
    position: absolute;
    height: 780px;
    width: 1200px;
    #background-color: gray;
    #border: 0px none;
  }
}