JSFiddle - React, Tailwind, and code Playground

HTML

<p>Foobar</p>
<input type="text" value="Foo" />
<textarea>Foobar</textarea>

CSS

body{
 -webkit-user-select: none;  
  -moz-user-select: none;    
  -ms-user-select: none;      
  user-select: none;
}