JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
  <li>here's some content</li>
  <li>here's some content</li>
  <li>here's some content</li>
  <li>here's some content</li>
  <li class="last"><img src="https://images.unsplash.com/photo-1481349518771-20055b2a7b24?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxzZWFyY2h8NHx8cmFuZG9tfGVufDB8fDB8fA%3D%3D&w=1000&q=80"></li>
</ul>

CSS

ul {
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  gap: 20px;
  max-width: 600px;
  margin: 0;
  list-style-type: none;
  padding: 0;
  height: 80vh;

}

li {
  flex: 1;
  border: 1px solid black;
}

li.last {
  flex-shrink: 0;
  height: 100%;
}

img {
  width: auto;
  height: 100%;

}