JSFiddle - React, Tailwind, and code Playground

HTML

<list>
  <item>Item 1</item>
  <item>Item 2</item>
  <item>Item 3
    <popup>I need to be above everyone to be a popup menu
    </popup>
  </item>
  <item>Item 4</item>
  <item>Item 5</item>
  <item>Item 6</item>
  <item>Item 7</item>
  <item>Item 8</item>
</list>

CSS

list {
  display: block;
  -webkit-backface-visibility: hidden;
}

item {
  display: block;
  -webkit-backface-visibility: hidden;
  border: 1px solid black;
  height: 50px;
  margin: 2px;
  position: relative;
  background-color: white;
}

popup {
  position: absolute;
  top: 5px;
  right: 5px;
  border: 2px solid red;
  height: 200px;
  width: 150px;
  background-color: white;
  z-index: 1000;
}