#ad_topslot {
  min-height: 200px;
  margin: 20px auto;
}

@media screen and (min-width: 740px) and (max-width: 974px) {
  #ad_topslot {
    min-height: 90px;
  }
}

@media screen and (max-width: 739px) {
  #ad_topslot {
    min-height: 100px;
  }

  @media screen and (max-height: 500px) {
    #ad_topslot {
      min-height: 50px;
    }
  }
}