JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test" class="unselectable" unselectable="on">asd</div>

CSS

*.unselectable {
   -moz-user-select: -moz-none;
   -khtml-user-select: none;
   -webkit-user-select: none;
   -ms-user-select: none;
   user-select: none;
}

#test {
   width: 200px;
   height: 200px;
   background: lightblue;        
}