.bottom-ad {
  position: relative;
  left: 50%;
  width: 100vw;
  margin: 28px 0 0;
  padding: 12px 0;
  transform: translateX(-50%);
  background: #fff;
  text-align: center;
}

@media (max-width: 760px) {
  .bottom-ad { margin-top: 20px; overflow-x: auto; overflow-y: hidden; }
}