Toggle modal popup from different buttons

I am trying to get this popup open from different buttons in the menu, however, the popup content would remain the same.

Thanks, Banick

function OpenModalT() {
  var modal = document.getElementById('myModalT');
  modal.style.display = "block";
}

function CloseModalT() {
  var modal = document.getElementById('myModalT');
  modal.style.display = "none";
}

<li>
  <a href="#" onclick="OpenModalT();">Button 1</a>

  <div id="myModalT" class="modal">
    <div class="modal-content">
      <span class="close" onclick="CloseModalT();">&times;</span>
      <p>
        <ppopup>
          <br>
          <br>
          <strong>Dummy text Dummy text Dummy Text <br><br> Kind Regards
          </strong>
        </ppopup>
      </p>
    </div>
  </div>
</li>

<li>
  <a href="#" onclick="OpenModalT();">Button 2</a>
</li>

Solution

Here's an example with which you can have any number of modals and buttons:

Use modals with a unique ID
Use <button type="button" data-modal="#some-modal-id"> to toggle your modals

const elsModals = document.querySelectorAll(".modal");

const toggleModal = (ev) => {
  const elBtn = ev.currentTarget;
  const elModal = document.querySelector(elBtn.dataset.modal);
  // Close all currently open modals:
  elsModals.forEach(el => {
    if (el !== elModal) el.classList.remove("is-active");
  });
  // Toggle open/close targeted one:
  elModal.classList.toggle("is-active");
};

const elsBtns = document.querySelectorAll("[data-modal]");
elsBtns.forEach(el => el.addEventListener("click", toggleModal));

/*QuickReset*/ * {margin:0; box-sizing: border-box;}

.modal {
  position: fixed;
  z-index: 99999;
  display: flex;
  justify-content: center;
  align-items: center;
  left: 0; top: 0;
  width: 100vw; height: 100vh;
  transition: 0.4s;
  backdrop-filter: blur(3px);
  background: rgba(0,0,0,0.1);
  pointer-events: none;
  visibility: hidden;
  opacity: 0;
}
.modal.is-active {
  pointer-events: auto;
  visibility: visible;
  opacity: 1;
}
.modal-content {
  position: relative;
  background: #fff;
  padding: 30px;
  box-shadow: 0 5px 20px -5px rgba(0,0,0,0.3);
}
.modal-close {
  position: absolute;
  top: 10px;
  right: 10px;
}

<div id="modal-regards" class="modal">
  <div class="modal-content">
    <button type="button" data-modal="#modal-regards" class="modal-close">&times;</button>
    <p>Dummy text Dummy text Dummy Text<br>Kind Regards</p>
  </div>
</div>

<div id="modal-help" class="modal">
  <div class="modal-content">
    <button type="button" data-modal="#modal-help" class="modal-close">&times;</button>
    <p>If something is not clear,<br>feel free to ask.</p>
  </div>
</div>

<button type="button" data-modal="#modal-regards">Kind regards</button>
<button type="button" data-modal="#modal-regards">Kind regards</button>
<button type="button" data-modal="#modal-help">Ask for help!</button>

Additionally:

Avoid using inline on* handlers same as you hopefully don't use inline style attributes- JS and CSS should be in one place only - and that's your files or tags.
Use a better code editor. ” is not quite the same as " - such editor will mark and highlight those small typos.
<ppopup> is an invalid HTML5 tag. – Roko C. Buljan 16 mins ago
Don't use <a href="#"> if you need a button. Use <button type="button"> instead.