.responsive_ads { width: 320px; height: 100px; }
@media(min-width: 500px) { .responsive_ads { width: 468px; height: 60px; } }
@media(min-width: 800px) { .responsive_ads { width: 728px; height: 90px; } }

.back-to-top {
  display: block;
  position: fixed;
  right: 20px;
  bottom: 20px;
  opacity: 0;
}

.gon-margin {
  margin-top:10px;
  margin-bottom:10px;
}

.gon-overflow {
  overflow: hidden;
}