JSFiddle - React, Tailwind, and code Playground

HTML

<div class="box">
<div class="my">Первый див</div>
<div class="my">Второй див</div>
<div class="my">Третий див</div>
</div>

CSS

.box {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
}
.my {
  padding: 10px;
  margin: 2px;
  flex-grow: 1;
  background-color: #0984e3;
  color: #fff;
}