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CSS

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JavaScript

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HTML 

              
                 <div class="guide">
      <p>Hello, this Page has 2 Modals.</p>
   
      <button class="modal-open" data-popup-trigger="modal1">
        Open Modal 1
      </button>
      <button class="modal-open" data-popup-trigger="modal2">
        Open Modal 2
      </button>
    </div>

    <div class="modal" id="modal1">
      <div class="modal-content">
        <div class="modal-close-button">&#10008;</div>
        <div class="modal-text">Content of the modal 1</div>
      </div>
    </div>

    <div class="modal" id="modal2">
      <div class="modal-content">
        <div class="modal-close-button">&#10008;</div>
        <div class="modal-text">
          <h2>Title of the Modal</h2>
          <br />
          Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse
          sollicitudin id ligula quis laoreet. Maecenas felis mi, dictum ac
          condimentum in, bibendum ut diam. Vestibulum iaculis scelerisque velit
          vel convallis. Praesent sodales sollicitudin tortor eu facilisis.
          Aenean in tincidunt sapien, id consequat nisi. Quisque interdum, justo
          at commodo sodales, diam ipsum venenatis odio, id aliquam leo massa
          nec felis. Aliquam in libero est. Ut ultricies eros diam, vitae
          ullamcorper nisl pretium eget. Etiam in gravida sem. Donec nec nisl
          pulvinar ligula hendrerit malesuada.
        </div>
      </div>
    </div>

View Tutorial at <a href="https://holycoders.com/tutorial/vanilla-javascript-popup-modal/" target="_blank">How to create Modals in Pure Vanilla Javascript</a>
!

CSS 

              
                /* General Styling */

@import url("https://fonts.googleapis.com/css2?family=Ubuntu&display=swap");

body {
  font-family: "Ubuntu", sans-serif;
  background-color: #ff7979;
  font-size: 1.2rem;
  color: #333;
}

button {
  background-color: #333;
  color: #fff;
  font-size: 1.2rem;
  padding: 10px;
  font-weight: 400;
  cursor: pointer;
  border-radius: 5px;
  border: 1px solid #d5d5d5;
}

.guide {
  text-align: center;
  color: #fff;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translateX(-50%) translateY(-50%);
}

/* General Styling Ends */

@keyframes scaleup {
  0% {
    transform: scale(0.2);
  }
  90% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}

.modal {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: #333;
  background-color: rgba(0, 0, 0, 0.7);
  animation: scaleup 0.2s ease-in;
}

.modal-content {
  position: absolute;
  top: 50%;
  background-color: #f2f2f2;
  border-radius: 5px;
  padding: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
}

.modal-close-button {
  position: absolute;
  background-color: #e74c3c;
  padding: 10px;
  border-radius: 50%;
  color: #fff;
  right: -20px;
  top: -20px;
  cursor: pointer;
}
.modal-close-button:hover {
  transition: all 0.2s;
  padding: 12px;
}

.show-modal {
  display: block;
}
!

JS 

              
                var modals = document.querySelectorAll(".modal-open");

    modals.forEach((element) => {
      //Add click listeners to open-modal buttons
      element.addEventListener("click", () => {

        //Get the unique popup modal for that button
        var popupModal = document.getElementById(element.dataset.popupTrigger);

        //Select the close button of current popup modal
        var popupModalCloseButton = document
          .getElementById(element.dataset.popupTrigger)
          .getElementsByClassName("modal-close-button")[0];

        // Show/hide modal on click by toggling the class
        popupModal.classList.toggle("show-modal");

        //Add event listener to close button on popup modal.
        popupModalCloseButton.addEventListener("click", () => {
          popupModal.classList.remove("show-modal");
        });

      });
    });
!
999px

Console