.ad-banner {
  width: 100%;
  max-width: 1000px;
  margin: auto;
}

.ad-banner img {
  width: 90%;
  aspect-ratio: 970 / 250; /* adjust to your image ratio */
  object-fit: cover;
  display: block;
}

#bottomBox {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;

    height: 90px;
    
    z-index: 9999;
    transition: height 0.3s ease;
    overflow: hidden;
  }

  #bottomBox.collapsed {
    height: 25px;
  }

  #bottomBox img {
    max-height: 90px;
    max-width: 100%;
  }

  /* Toggle Button */
  #toggleBtn {
    position: absolute;
    left: 50%;
    top: 0;
    transform: translateX(-50%);
    background: red;
    border: none;
    font-size: 12px;
    cursor: pointer;
    padding: 2px 8px;
    border-radius: 0 0 5px 5px;
    width: 30px;
    height: 20px;
  }