Add justify content end on header.

templates/layout/page.html.twig

@@ -95,10 +95,10 @@
             {{ page.header }}
             {% if page.primary_menu or page.header_form %}
               <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#CollapsingNavbar" aria-controls="CollapsingNavbar" aria-expanded="false" aria-label="Toggle navigation"><span class="navbar-toggler-icon"></span></button>
-              <div class="collapse navbar-collapse" id="CollapsingNavbar">
+              <div class="collapse navbar-collapse justify-content-end" id="CollapsingNavbar">
                 {{ page.primary_menu }}
                 {% if page.header_form %}
-                  <div class="form-inline navbar-form ml-auto">
+                  <div class="form-inline navbar-form justify-content-end">
                     {{ page.header_form }}
                   </div>
                 {% endif %}