center div by flex

by meetsonusharma

HTML

<div class="parent">

  <div class="child">

  </div>
</div>

CSS

.parent {
  width: 300px;
  height: 200px;
  border: 1px solid black;
  display: flex;
  align-items:center;
  justify-content:center;
}

.child {
  width: 200px;
  height: 100px;
  border: 1px solid red;
}