JSFiddle - React, Tailwind, and code Playground

HTML

<span>This text should not be selectable</span>
<p>This text should be selectable</p>

CSS

* {
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
}

p, h1, h2, h3, h4, h5 {
    -webkit-user-select: normal;
    -khtml-user-select: normal;
    -moz-user-select: normal;
    -o-user-select: normal;
    user-select: normal;
}