JSFiddle - React, Tailwind, and code Playground

HTML

<div class="b1 b1-1 activ"></div>
<div class="b1 ln">|</div>
<div class="b1 b1-2"></div>
<div class="b1 ln">|</div>
<div class="b1 b1-3"></div>
<div class="b1 ln">|</div>
<div class="b1 b1-4"></div>

CSS

.activ + .ln{display:none;}