JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="item">kek</div>
  <div class="item">kek</div>
  <div class="item">kek</div>
  <div class="item">kek</div>
</div>

CSS

.container{
  width: 70%; /*378px*/
  margin: 0 auto;
  background: lavender;
  display: flex;
  flex-direction: column;
}

.item{
  background: beige;
  margin-bottom: 5%; /*18px*/
}