JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
<object width="400" height="400" class="ob" data="helloworld.swf">
</object>
</div>

CSS

.parent {
  background-color:yellow;
}

.ob {
  margin: 0 auto;
  border: 1px solid black;
  display: block;
}