JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="big">
    hello
  </div>
  <div>
    bonjour
  </div>
</div>

CSS

.parent {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
}

.parent > div {
  border-color: gray;
  border-style: solid;
  border-width: 5px;
}

.big {
  height: 100px;
}