A simple login form using JavaScript programming language. I hope you will find my work useful.

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Program Listing

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple Login Form Using JavaScript</title>
    <style>
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: #01C3FF;
            font-family: sans-serif;
        }
        form,
        .message {
            padding: 30px;
            border-radius: 3px;
            background: #fff;
        }
        h2, h4 {
            margin: 5px 0;
            color: #1F1A19;
            text-align: center;
            line-height: 1.2;
        }
        input {
            display: block;
            padding: 8px 3px;
            outline: none;
            font-size: 12px;
            border-top: 0;
            border-right: 0;
            border-left: 0;
            border-bottom: 2px solid #01C3FF;
            border-radius: 0;
            margin-top: 10px;
            width: 100%;
            color: #888;
        }
        input:first-of-type {
            margin-top: 15px;
        }
        .btn {
            padding: 8px ;
            text-align: center;
            display: block;
            width: 100%;
            cursor: pointer;
            border: none;
            background: #01C3FF;
            color: #fff;
            margin-top: 10px;
            border-radius: 3px;
            text-decoration: none;
        }
        button:hover {
            opacity: 0.9;
        }
        .hide {
            display: none;
        }
        #messageDetails {
            margin-bottom: 20px;
            text-align: center;
        }
    </style>
</head>
<body>
    <form action="" id="frmLogin">
        <hr>
        <h2>Simple Login Form<br>Using JavaScript</h2>
        <h4>Jake R. Pomperada, MAED-IT, MIT</h4>
        <hr>

        <input type="text" name="txtUsername" id="txtUsername" placeholder="Enter your username" required>
        <input type="password" name="txtPassword" id="txtPassword" placeholder="Enter your password" required>
        <button type="submit" class="btn">Login</button>
    </form>

    <div class="message hide">
        <p id="messageDetails"></p>
        <a href="" class="btn">Reset</a>
    </div>

    <script>
        document.querySelector('form').onsubmit  = (e) => {
            e.preventDefault()

            let username  = "admin", 
                password  = "admin",
                inputUser = document.querySelector('#txtUsername').value,
                inputPass = document.querySelector('#txtPassword').value

            if (inputUser != username || inputPass != password) {
                document.querySelector('#messageDetails').innerHTML = "Username and Password do not match.<br>Please try again."
            }
            if (inputUser == username && inputPass == password) {
                document.querySelector('#messageDetails').innerHTML = "Success!<br>You're currently logged in now."
            }

            document.querySelector('#frmLogin').classList.add("hide")
            document.querySelector('.message').classList.remove("hide")
        }
    </script>
</body>
</html>

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