JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content">This is some text.
     <h1>A heading</h1>
Some more text.
     <h1>A Second heading</h1>
Some more text.
     <h1>A Third heading</h1>
Some more text.</div>

CSS

#content h1 {
    margin-top: 1em;
}
#content h1:not(:first-child) {
    margin: 0px;
}