JSFiddle - React, Tailwind, and code Playground

HTML

<div>
  <img src="https://cdn.pixabay.com/photo/2015/04/23/22/00/tree-736885__480.jpg">
</div>

CSS

body {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
}

div {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 20%;
}