details {
      margin-bottom: 1em;
      border: 1px solid #ccc;
      border-radius: 5px;
      padding: 10px;
      background-color: #f9f9f9;
    }

summary {
      font-weight: bold;
      cursor: pointer;
      padding: 5px;
}

details[open] {
      background-color: #f3eee9;
}