JSFiddle - React, Tailwind, and code Playground

HTML

<textarea class="expand close" id="newtxtid" name="ta" wrap="hard" spellcheck="false"></textarea>

CSS

.txtClass{ color: #900; margin-top:20px;
   }
 .txtClass:hover{ margin-top:0px;
   }

JavaScript

$('#newtxtid').addClass('txtClass');