@media only screen and (max-width: 786px) {
 .mobilreklam {
    display: block;
  }
  .pcreklam {
    display: none;
  }
}

@media only screen and (min-width: 768px) {
  .pcreklam {
    display: block;
  }
  .mobilreklam {
    display: none;
  }
}