Added highlight for login/register buttons a.k.a. finished the task

main/templates/base/menu.html

@@ -35,8 +35,18 @@
       </div>
     {% else %}
       <div class="btn-group" role="group" aria-label="Basic example" style="margin-right: 9px">
-        <a class="btn btn-secondary" href="/accounts/login">Войти</a>
-        <a class="btn btn-secondary" href="/accounts/register">Зарегистрироваться</a>
+        <a {% if login_lit %}
+            class="btn btn-primary"
+          {% else %}
+            class="btn btn-secondary"
+          {% endif %}
+          href="/accounts/login">Войти</a>
+        <a {% if registration_lit %}
+            class="btn btn-primary"
+          {% else %}
+            class="btn btn-secondary"
+          {% endif %}
+          href="/accounts/register">Зарегистрироваться</a>
       </div>
     {% endif %}
   </nav>