<style type="text/css">
  article { width: 100%; }
  article p { width: 800px; margin: 0 auto; }
  article figure { width: 2500px; margin: 0 auto; }
</style>

<article>
  <p>Lorem Ipsum...</p>
  <figure>
    <img src="/img.png" alt="demo image" />
  </figure>
  <p>Lorem Ipsum...</p>
</article>