@media (max-width: 768px) {
  .ad-banner {
    padding: 8px 10px;
    border-bottom: none;
    background-color: #f9f9f9;
    display: none;
  }

  .ad-banner img {
    border-radius: 4px;
    box-shadow: none;
    margin-bottom: 8px;
  }
}