JSFiddle - React, Tailwind, and code Playground

HTML

<div class="commentList">
    <article class="comment " id="com21"></article>

    <article class="comment " id="com20"></article>

    <article class="comment " id="com19"></article>
    
    <div class="something"> hello </div>
</div>

CSS

body {
    background: black;
}

.comment {
    width:470px;
    border-bottom:1px dotted #f0f0f0;
    margin-bottom:10px;
}

.comment:last-child {
    border-bottom:none;
    margin-bottom:0;
}