JSFiddle - React, Tailwind, and code Playground

HTML

<div class="root">
<div class="item">

</div>
<div class="item">

</div>
<div class="item">

</div>
<div class="item">

</div>
<div class="item">

</div>
<div class="item">

</div>
<div class="item">

</div>
<div class="item">

</div>
<div class="item">

</div>
<div class="item">

</div>
<div class="item">

</div>
<div class="item">

</div>
<div class="item">

</div>
</div>

CSS

.root {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.item {
  flex: 1 1 30%;
  max-width: 300px;
  min-width: 100px;
  border: 1px solid #aaa;
  height: 200px;
}

.item:nth-child(3) {
  height: 300px;
}