Update index.html

public/index.html

@@ -50,7 +50,7 @@
             <input type="password" name="password" class="login_form_field" placeholder="Password">                
             <!-- button -->
             <a href="future.html">
-                <button class = "login_submit_form">Submit</button>
+                <button class = "login_submit_form" type = "submit">Submit</button>
             </a>
             <nav class = "nav_form_field">
                 <a href="./new_user_page.html">New User</a>