JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
  <div class="row_block">
    
  </div>
  <div class="row_block">
    
  </div>
  <div class="row_block">
    
  </div>
</div>

CSS

.row {
  width: 650px;
  margin: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.row_block {
  height: 250px;
  background: ccc;
  border: 3px solid #111;
  flex-basis: calc(50% - 5px);
  margin-bottom: 10px;
  box-sizing: border-box;
}