tweak login form

templates/security/login.html.twig

@@ -34,13 +34,13 @@
             </label>
         </div>
     #}
-
+    <br>
     <button class="btn btn-lg btn-primary" type="submit">
         Sign in
     </button>
 </form>
-
+    <br>
     <button class="btn btn-lg btn-secondary" type="submit">
-        <a href={{ path('app_register') }}>Register</a>
+        <a style="text-decoration: none; color: white;" href={{ path('app_register') }}>Register</a>
     </button>
 {% endblock %}