index.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">

    <title>Greet Me App!</title>

    <style>
        body{
            width: 100vw;
            height: 100vh;

            background-color: rgb(155, 49, 0);
        }
    </style>
  </head>
  <body class="d-flex flex-column justify-content-center align-items-center">


    <h3 class="display-4 text-center text-white">
        I will greet you!
    </h3>
    <button class="mt-3 px-5 btn btn-success fs-2" onclick="greetme()">
        Press me 🤖
    </button>
    <h3 class="display-1 text-center text-white mt-5" id="greetings"></h3>


    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>
    <script>
        // Function that will greet you when clicked
        function greetme() {
            // Prompt for name
            let name = prompt("What's your name?");

            // Check name should not be NULL
            if (name != null) {
                // Inserts greeting texts into the div
                document.getElementById("greetings").innerText = "Hello, " + name + "❤️";
            };
        };
    </script>

  </body>
</html>