diff --git a/cas_server/templates/cas_server/login.html b/cas_server/templates/cas_server/login.html
index 161a5c1..64d7567 100644
--- a/cas_server/templates/cas_server/login.html
+++ b/cas_server/templates/cas_server/login.html
@@ -15,7 +15,7 @@
         <h2 class="form-signin-heading">{% trans "Please loggin" %}</h2>
 {% csrf_token %}
 {% bootstrap_form form %}
-{% bootstrap_button _('Login') size='lg' button_type="submit" button_class="btn-block"%}
+{% bootstrap_button _('Login') size='lg' button_type="submit" button_class="btn-primary btn-block"%}
       </form>
 </div>
 <div class="col-md-3"></div>