Demo: CSS position

<div class='container'>
  <div class='box'>Box 1</div>
  <div class='box absolute-box'>Box 2 (Absolute)</div>
  <div class='box'>Box 3</div>
</div>

.container {
  position: relative;
  width: 300px;
  height: 300px;
  border: 2px solid #000;
  margin: 20px;
}

.box {
  width: 100px;
  height: 100px;
  background-color: lightblue;
  margin: 10px;
  text-align: center;
  line-height: 100px;
}

.absolute-box {
  position: absolute;
  top: 50px;
  left: 50px;
  background-color: coral;
}

// No JavaScript required for this demo