Edit fiddle - JSFiddle - React, Tailwind, and code Playground

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HTML

<div class="separar"></div>
<div class="separar"></div>
<div class="separar"></div>
<div class="separar"></div>
<div class="separar"></div>
<div class="separar"></div>
<div class="separar"></div>
<div class="separar"></div>

CSS

.separar{
margin-right:20px;
margin-bottom:20px;
border-bottom:1px solid black;
}

.separar:nth-child(4n+4) {
margin-right:0px;
border-bottom-color:red;
}

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JSFiddle - React, Tailwind, and code Playground

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CSS

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Use pre-released features

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Console