JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <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

.container {
  display: flex;
  border: 1px solid #ccc;
  flex-wrap: wrap;
  justify-content: space-between;
}
.item {
  width: 100px;
  height: 100px;
  background: #ccc;
  margin-top: 5px;
  margin-bottom: 5px;
}