<div class="accordion">

  <details>

    <summary>Title</summary>

    This is all description

  </details>

  <details>

    <summary>Title 2</summary>

    This is all description 2

  </details>

</div>

<details open>

  <summary>System Requirements</summary>

  <p>

    Requires a computer running an operating system. The computer must have some

    memory and ideally some kind of long-term storage. An input device as well

    as some form of output device is recommended.

  </p>

</details>

<details>

  <summary>System Requirements</summary>

  <p>

    Requires a computer running an operating system. The computer must have some

    memory and ideally some kind of long-term storage. An input device as well

    as some form of output device is recommended.

  </p>

</details>