--- /dev/null
+{#
+/**
+ * @file
+ * Default theme implementation to display a Drupal installation page.
+ *
+ * All available variables are mirrored in page.html.twig.
+ * Some may be blank but they are provided for consistency.
+ *
+ * @see template_preprocess_install_page()
+ *
+ * @ingroup themeable
+ */
+#}
+ <div class="layout-container">
+
+ <header role="banner">
+ {% if site_name or site_slogan %}
+ <div class="name-and-slogan">
+ {% if site_name %}
+ <h1>{{ site_name }}</h1>
+ {% endif %}
+ {% if site_slogan %}
+ <div class="site-slogan">{{ site_slogan }}</div>
+ {% endif %}
+ </div>{# /.name-and-slogan #}
+ {% endif %}
+ </header>
+
+ <main role="main">
+ {% if title %}
+ <h2>{{ title }}</h2>
+ {% endif %}
+ {{ page.highlighted }}
+ {{ page.content }}
+ </main>
+
+ {% if page.sidebar_first %}
+ <aside class="layout-sidebar-first" role="complementary">
+ {{ page.sidebar_first }}
+ </aside>{# /.layout-sidebar-first #}
+ {% endif %}
+
+ {% if page.sidebar_second %}
+ <aside class="layout-sidebar-second" role="complementary">
+ {{ page.sidebar_second }}
+ </aside>{# /.layout-sidebar-second #}
+ {% endif %}
+
+ {% if page.footer %}
+ <footer role="contentinfo">
+ {{ page.footer }}
+ </footer>
+ {% endif %}
+
+ </div>{# /.layout-container #}