#popup-iklan {
      position: fixed;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 900px;
      background: white;
      border: 2px solid #ccc;
      box-shadow: 0 0 15px rgba(0,0,0,0.5);
      padding: 20px;
      z-index: 1000;
      display: none;
    }
    #popup-iklan img {
      width: 100%;
    }
    #popup-iklan .close-btn {
      position: absolute;
      top: 5px;
      right: 10px;
      font-size: 18px;
      cursor: pointer;
      color: #333;
    }
    #overlay {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0,0,0,0.5);
      display: none;
      z-index: 999;
    }