.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 10px;
}

.article {
  margin-bottom: 20px;
}

.ad-container {
  position: fixed;
  bottom: 0;
  width: 100%;
  background-color: #f1f1f1;
  display: flex;
}

.ad {
  flex: 1;
  height: 100px;
  text-align: center;
  padding: 10px;
}

.ad img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* 媒体查询 */
@media only screen and (max-width: 600px) {
  /* 手机端样式 */
  .container {
    max-width: 100%;
    padding: 5px;
  }

  .article {
    margin-bottom: 10px;
  }

  .ad-container {
    position: static;
    flex-wrap: wrap;
  }

  .ad {
    flex: 1 1 50%;
    height: 80px;
    padding: 5px;
  }
}