JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px;
}

.item {
  background-color: gray;
  padding: 10px;
  max-width: calc(100% / 4 - 24px);
  width: 100%;
}