3 buttons have different inputs but showing the same output as the first button

I have 3 modal buttons. All three buttons have different inputs. But when I press the first button, everything is showing completely fine but when I press the 2nd and 3rd button, it shows the same results as the first button. Please have a look, I am attaching my code below.

Extra: It would be very helpful for me if you can suggest me, how I can put multiple photos stacked in the modal body without losing the shape of the modal. It will show a single photo in the modal body but if someone swap over the picture then the next picture will arrive. Thank you so much.

// Modal
// Get DOM Elements
const modal = document.querySelector('#my-modal');
const modalBtn = document.querySelectorAll('.button');
const closeBtn = document.querySelector('.close');

// Events
modalBtn.forEach(btn => btn.addEventListener('click', openModal));
closeBtn.addEventListener('click', closeModal);
window.addEventListener('click', outsideClick);

// Open
function openModal() {
  modal.style.display = 'block';
}

// Close
function closeModal() {
  modal.style.display = 'none';
}

// Close If Outside Click
function outsideClick(e) {
  if (e.target == modal) {
    modal.style.display = 'none';
  }
}

/* Modal section styling */

:root {
    --modal-duration: 1s;
    --modal-color: crimson;
  }
  
  .button {
    font-family: 'poppins', sans-serif;
    display: inline-block;
    background: crimson;
    color: #fff;
    font-size: 18px;
    font-weight: 500;
    padding: 8px 16px;
    margin-top: 20px;
    border-radius: 6px;
    border: 2px solid crimson;
    transition: all 0.3s ease;
  }
  
  .button:hover {
    color: crimson;
    background: none;
  }
  
  .modal {
    display: none;
    position: fixed;
    z-index: 99999;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
  }
  
  .modal-content {
    margin: 50px auto;
    width: 60%;
    box-shadow: 0 5px 8px 0 rgba(0, 0, 0, 0.2), 0 7px 20px 0 rgba(0, 0, 0, 0.17);
    animation-name: modalopen;
    animation-duration: var(--modal-duration);
  }
  
  .modal-header h2,
  .modal-footer h3 {
    margin: 0;
  }
  
  .modal-header {
    background: var(--modal-color);
    text-align: center;
    padding: 10px;
    color: #fff;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
  }
  
  .modal-body {
    padding: 10px 5px 1px 5px;
    background: #fff;
  }
  
  .modal-footer {
    background: var(--modal-color);
    padding: 10px;
    font-size: 15px;
    font-weight: lighter;
    color: #fff;
    text-align: center;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
  }
  
  .close {
    color: #ccc;
    float: right;
    font-size: 30px;
    color: #fff;
  }
  
  .close:hover,
  .close:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
  }
  .responsive {
    width: 100%;
    height: auto;
  }
  @keyframes modalopen {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }

<!-- Modal Button 1 start -->
<button id="modal-btn" class="button">Parkit</button>
<div id="my-modal" class="modal">
  <div class="modal-content">
    <div class="modal-header">
      <span class="close">&times;</span>
      <h3>Vehicle Parking Application</h3>
    </div>
    <div class="modal-body">
      <img src="https://thefinancialexpress.com.bd/uploads/1575560371.jpg" alt="Vehicle Parking Application" class="responsive">
    </div>
    <div class="modal-footer">
      <p>
      Footer
      </p>
    </div>
  </div>
</div>
<!-- Modal Button 1 end -->

<!-- Modal Button 2 start -->
<button id="modal-btn2" class="button">IPDC IMS</button>
<div id="my-modal2" class="modal">
  <div class="modal-content">
    <div class="modal-header">
      <span class="close">&times;</span>
      <h3>Asset Management System</h3>
    </div>
    <div class="modal-body">
      <img src="#" alt="Asset Management System" class="responsive">
    </div>
    <div class="modal-footer">
      ...
    </div>
  </div>
</div>
<!-- Modal Button 2 end -->

<!-- Modal Button 3 start -->
<button id="modal-btn3" class="button">Gaming Website</button>
<div id="my-modal3" class="modal">
  <div class="modal-content">
    <div class="modal-header">
      <span class="close">&times;</span>
      <h3>Gaming Website</h3>
    </div>
    <div class="modal-body">
      ...
    </div>
    <div class="modal-footer">

    </div>
  </div>
</div>
<!-- Modal Button 3 end -->