JSFiddle - React, Tailwind, and code Playground

HTML

<div class="z">
  <div class="z1">1</div>
  <div class="z1">2</div>
  <div class="z1">3</div>
</div>

CSS

.z {
  display: flex;
  align-items: flex-start;
  /* flex-direction: column; */
  flex-wrap: wrap;
  height: 1000px;
  background: #900;
}
.z1 {
  min-width: 51%;
  background: #0f0;
}