<button onclick="moveDiv()">Move</button>

<button onclick="returnDiv()">Return</button>

<div id="demo"><div>
#demo {
  width: 100px;
  height: 100px;
  background: red;
  position: absolute;
  left: 5px;
  top: 40px;
  transition: all 0.5s linear;
}

function moveDiv() {
  document.getElementById("demo").style.left = "400px";
}

function returnDiv() {
  document.getElementById("demo").style.left = "5px";
}
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