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CSS

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HTML 

              
                <div class="container">
  <h1>Full Screen Modal Demo</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua...</p>
  <p></p>
<button
        aria-label="Click to Toggle Full Screen View of Section"
        class="fullscreener button buttonBlue"
      >
        Open Modal
      </button>
  <section 
    role="dialog"
    aria-modal="true"
           
aria-labelledby="modalLabel"           class="fullscreenEnabled fullscreenModal"
>
  <div class="modalContent">
    <h2
  id="modalLabel"       class="fullscreenMoreInfo">This is the promised full screen mode!</h2>
    <span role="button" tabindex="0" aria-label="Close the modal" class="fullscreener close"></span>
    <div class="modalBody">
       <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam in ligula ex. Nullam feugiat malesuada massa at ultricies. Nam sed vestibulum velit. Aliquam egestas aliquam vestibulum. Sed nibh mi, tristique iaculis ornare porttitor, rhoncus nec eros. Fusce consequat elit ut justo iaculis, at ultrices nunc maximus. Proin ut tellus mattis, dapibus metus nec, dapibus elit. Cras eget egestas diam. Morbi aliquam dolor aliquam justo viverra, id aliquam ipsum malesuada. Etiam commodo iaculis diam id pretium.</p>

<p>Proin eget commodo ligula. Duis et consectetur tortor, id dictum urna. Praesent non est ligula. Nullam semper tellus sit amet magna feugiat, in hendrerit lacus fringilla. Nulla rhoncus consectetur tortor, quis iaculis diam dapibus vel. Fusce vitae sodales tortor, vitae mollis magna. Proin vel facilisis dolor. Aenean ultrices lacinia ornare. Suspendisse potenti. Proin ornare enim in libero tincidunt, a gravida nunc aliquam. Sed commodo egestas augue eu lacinia.</p>

<p>Nam ultricies efficitur diam at pellentesque. Duis tincidunt, tellus a pretium fringilla, lorem erat elementum augue, ultrices varius magna risus non sapien. Maecenas sollicitudin arcu id ligula malesuada consequat. Etiam malesuada ante in ipsum fringilla pharetra. Nunc dignissim massa eu dapibus pharetra. Donec non congue ante. Donec turpis sem, aliquet eget augue id, mollis efficitur libero. Etiam bibendum malesuada tincidunt. Nam consectetur molestie consectetur. Vivamus libero nunc, congue id rhoncus quis, condimentum aliquet metus. Maecenas scelerisque sem non orci ullamcorper, eget hendrerit magna pellentesque. Interdum et malesuada fames ac ante ipsum primis in faucibus. Pellentesque non sapien massa. In eu pulvinar nibh, sed pharetra ex. Nunc non maximus augue. </p>
      </div>
    </div>
  
  </section>

</div>
!

CSS 

              
                
* {
  box-sizing: border-box;
}

body {
  font: PT Sans;
  background-color: #000;
  color: #ffefef;
}

.container {
  max-width: 72rem;
  margin: 0 auto;
  padding: 2rem;
}



.fullscreenModal {
  display: none;
}

.fullscreenModal:fullscreen {
  display:block;
  padding: 1rem;
}

/* Styles for buttons taken from Logrocket article 

CSS Reference Guide: Button styling

https://blog.logrocket.com/css-reference-guide-button-styling/ */

.button {
  padding: 6px 12px;
  margin-bottom: 0;
  font-weight: 400;
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
  display: inline-block;
  background-image: none;
  border-radius: 3px;
  box-shadow: none;
  border: 1px solid transparent;
}

.buttonBlue {
  color: #fff;
  background-color: blue;
  border-color: #2e6da4;    
}

.buttonBlue:focus {
  color: black;
  background-color: lightblue;
}

.modalContent {
  margin: 1rem;
  border: 2px dashed white;
  height: 95vh;
}
.close {
  position: relative;
  display: block;
}

.close::after {
  right: 1rem;
  top: -3rem;
  width: 2rem;
  height: 2rem;
  position: absolute;
  display: flex;
  z-index: 1;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  border-radius: 50%;
  border: 2px solid white;
  color: white;
  content: "X";
  cursor: pointer;
}

.close:focus:after {
  color: yellow;
  border-color: yellow;
}

.fullscreenMoreInfo {
  text-indent: 1rem;
  padding-right: 1rem;
  padding-top: .5rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid white;
  border-right: 1px solid white;
  width: max-content;
  margin-top: 2px;
}

.modalBody {
  width: 90vw;
  margin-left: auto;
  margin-right: auto;
}
!

JS 

              
                const makeFullScreen = (el) => {
   if (!document.fullscreenElement) {
     el.requestFullscreen();
     return;
  } 
    document.exitFullscreen();
 
}

const  buttons = document.querySelectorAll(".fullscreener");
const fullScreenEnabledEl = document.querySelector(".fullscreenEnabled");
buttons.forEach( (button) => {
button.addEventListener("click", () => {
 makeFullScreen(fullScreenEnabledEl);
});
button.addEventListener('keydown', (e) => {
  if (e.key === "Enter") {
    makeFullScreen(fullScreenEnabledEl);
  }
});

});
!
999px

Console