JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="first">Lorem ipsum blah blah blah</div>
  <div class="second">Something</div>
</div>
<div class="parent">
  <div class="first">Lorem ipsum blah blah blah</div>
</div>

<!-- Нежелательный рабочий костыль -->
<div class="parent">
  <div class="first you-have-second">Lorem ipsum blah blah blah</div>
  <div class="second">Something</div>
</div>

CSS

.parent { background-color: green; width: 300px; overflow: hidden; margin-bottom: 5px; }
.first { background-color: yellow; margin: 10px; }
.second { background-color: red; }

.you-have-second { margin-bottom: 0; }