JSFiddle - React, Tailwind, and code Playground

HTML

<div class="popup">
  <div class="mission">
    Mission
  </div>
</div>

<div class="introjs">
</div>

CSS

.popup {
  position: fixed;
  z-index: 5;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background-color: rgba(0,0,128,0.5);
  display: flex;
  justify-content: center;
  align-items: center;
}

.mission {
  background-color: rgba(200, 0, 0, 0.9);
  color: white;
  width: 200px;
  height: 100px;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 7;
}

.introjs {
  background-color: white;
  width: 250px;
  height: 150px;
  z-index: 6;
  position: fixed;
  left: 270px;
  top: 130px;
}