JSFiddle - React, Tailwind, and code Playground

HTML

<div class="itemA"></div>
<div class="itemA"></div>
<div class="itemB"></div>
<div class="itemB"></div>
<div class="itemB"></div>

CSS

.itemA{
  width: 200px;
  height: 30px;
  border-top: 2px solid #fff;
  background-color: #000;
}

.itemB{
  width: 200px;
  height: 30px;
  border-top: 2px solid #fff;
  background-color: #000;
}

.itemA:first-child{
  background-color: #ccc;
}

.itemB:first-child{
  background-color: #ccc;
}