#native-banner-slot {
  width: min(100%, 320px);
  max-width: 320px;
  margin: 0 auto 8px;
  display: none;
  box-sizing: border-box;
}
#native-banner-slot.is-visible {
  display: block;
}
#native-banner-slot .native-banner-inner {
  width: 100%;
  max-width: 320px;
  box-sizing: border-box;
  overflow: hidden;
}