.collapsible {
      background-color: #eee;
      cursor: pointer;
      padding: 10px;
      width: 100%;
      border: none;
      text-align: left;
      outline: none;
      font-size: 16px;
    }

    .collapsible.active {
      background-color: #ccc;
    }

    .content {
      padding: 0 10px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.2s ease-out;
      background-color: #f9f9f9;
    }