JSFiddle - React, Tailwind, and code Playground

HTML

<header><img src="https://www.clinique-veterinaire-stang-zu-quimper.fr/sitev7/source/image/chaton.jpg" alt=""></header>

<div><img src="https://www.clinique-veterinaire-stang-zu-quimper.fr/sitev7/source/image/chaton.jpg" alt=""></div>

CSS

img {
  display: block;
  margin: 0 auto;
}