JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
  <div class="col-md-6"></div>
  <div class="col-md-6"></div>
</div>

<div class="norow">
  <div class="col-md-6"></div>
  <div class="col-md-6"></div>
</div>

CSS

.row {
  border: 2px solid yellow;
}
.norow {
  border: 2px solid green;
}

.col-md-6 {
  height: 50px;
  border: 2px solid red;
}