JSFiddle - React, Tailwind, and code Playground

HTML

<p>13231<em>666</em></p>
     <h1>Aaaaa</h1>

CSS

p{
 margin-bottom: -30px;
    position: relative;
    color: red;
    display: flex;
    background: blue;
}
h1{
    position: relative;
    z-index: 2;
    background: green;
}
p em{
    background: red;
    z-index: 3;
}