JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
  <style>
  div { width: 200px; height: 150px; background-color: #f33; border: 10px solid silver;}
  </style>
</head>
<body>
  
  <div id="a1"></div>
  
  
  <br>
  
  <br>
  
    <div id="a3">click</div>  


</body>
</html>

JavaScript

$("#a3").click(function() {
    $('#a1').css("border", "");
    
}):