JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="UTF-8">
    <title>Sample Code</title>
    <link rel="stylesheet" href="css\styles.css">
  </head>
    <body>
        <p id="hello"></p>
        <script src="js\main.js"></script>
    </body>
</html>

JavaScript

let hello = document.getElementById("hello");

document.addEventListener("click", () => {
  hello.textContent = "こんにちは！";
});