JSFiddle - React, Tailwind, and code Playground
HTML
<div class="wrapper">
<div class="row">
line 1 (should be red)
</div>
<div class="notrow">
line 1.5 not row
</div>
<div class="row">
line 2
</div>
<div class="row">
line 3 (should be red)
</div>
<div class="row">
line 4
</div>
</div>
CSS
.row:nth-child(odd) {
background: red;
}