Login page technically functional.

demo/src/main/resources/templates/login.html

@@ -18,9 +18,13 @@
     <main class="main-content">
       <div class="login-box">
         <h2>Log In</h2>
-        <form action="/login" method="post">
+        <div th:if="${param.error}">
+          Invalid username and password.</div>
+        <div th:if="${param.logout}">
+          You have been logged out.</div>
+        <form th:action="@{/login}" method="post">
           <label for="username">Username</label>
-          <input type="text" id="user" name="user" required>
+          <input type="text" id="username" name="username" required>
 
           <label for="password">Password</label>
           <input type="password" id="password" name="password" required>