JSFiddle - React, Tailwind, and code Playground

HTML

<body onload="makeVisible();">
  <span id="right_link" onclick="makeVisible();">>>></span>

  <div id="container">
  </div>

  <div id="inner">
    <div>
      <span>Info will go here.</span>
      <p>More info</p>

      <div class="link" onclick="makeVisible();">Back</div>
    </div>
  </div>
</body>

CSS

#container {
  background-color: #ffffff;
  height: 100%;
  opacity: 0.75;
  position: absolute;
  width: 100%;
  visibility: hidden;
  top: 0;
}

#inner {
  background-color: #888888;
  border-radius: 100%;
  height: 500px;
  left: 50%;
  position: absolute;
  top: 50%;
  width: 500px;
  transform: translate(-50%, -50%);
  z-index: 100;
  visibility: hidden;
}

#inner > div {
  color: #ffffff;
  height: 68.5%;
  left: 50%;
  padding-top: 20px;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 68.5%;
}

#inner > div > .link {
  bottom: 0;
  display: block;
  position: absolute;
  right: 0;
  text-align: center;
  width: 100%;
}

#inner > div > span {
  display: inline-block;
}

JavaScript

function makeVisible() {
  var con = document.getElementById('container');
  var inn = document.getElementById('inner');

  if (con.style.visibility == "hidden") {
    con.style.visibility = "visible";
    inn.style.visibility = "visible";

  } else {
    con.style.visibility = "hidden";
    inn.style.visibility = "hidden";
  }
}