login.html

<!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>LOGIN</title>
    <link rel="stylesheet" href="loginstyle.css">
</head>
<body>
    <div class="login-box">
        <h2>Login</h2>
        <form name="loginForm" action="contributors.html" method="post">
          <div class="user-box">
            <input type="text" name="username" required="">
            <label>Username</label>
          </div>
          <div class="user-box">
            <input type="password" name="password" required="">
            <label>Password</label>
          </div>
          <a href="contributors.html" onclick="return formValidator();">
            <span></span>
            <span></span>
            <span></span>
            <span></span>
            Submit
          </a>
        </form>
    </div>
    <script src="https://unpkg.com/sweetalert/dist/sweetalert.min.js"></script>
    <script src="loginapp.js"></script>
</body>
</html>