#sidebar {
  width: 250px;
  background: #fff;
}
  .sidebar_banner {
    width: 100%;
  }
  .sidebar_head {
    width: 100%;
    padding: 5px 0 5px 10px;
    background: #2774cc;
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
    color: #fff;
    font-weight: bold;
  }
  .sidebar_list {
    width: 100%;
    margin-bottom: 8px;
    padding: 5px;
    border: solid 1px #2774cc;
  }
    .sidebar_list img  {
      max-width: 100%;
    }
    .sidebar_list_item {
      display: block;
      margin-top: 20px;
    }
      .sidebar_list_item img {
        width: 100%;
        max-height: 60px;
        object-fit: contain;
      }
  
  #sidebar .article-list_list_item {
    width: 100%;
  }

@media screen and (max-width: 768px) {
  #sidebar {
    display: none;
  }
}