JSFiddle - React, Tailwind, and code Playground

HTML

<div class="flexContainer">
  <div class="flexItem">
    <div class="flexItemContent">
      bla
    </div>
  </div>
  <div class="flexItem">
    <div class="flexItemContent">
      bla
      <br /> bla
      <br /> bla
      <br /> bla
    </div>
  </div>
  <div class="flexItem">
    <div class="flexItemContent">
      bla
      <br /> bla
      <br /> bla
      <br /> bla
    </div>
  </div>
  <div class="flexItem">
    <div class="flexItemContent">
      bla
      <br /> bla
      <br /> bla
      <br /> la
      <br /> bla
      <br /> bla
      <br /> bla
    </div>
  </div>
</div>

CSS

.flexContainer {
  display: flex;
  flex-wrap: wrap;
}

.flexItem {
  width: 300px;
  border: 1px solid black;
  margin: 5px;
}

.flexItemContent {
  background-color: green;
  height: 100%;
}