--- /dev/null
+{#
+/**
+ * @file
+ * Seven 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()
+ */
+#}
+<div class="layout-container">
+
+ <header role="banner">
+ {% if site_name %}
+ <h1 class="page-title">
+ {{ site_name }}
+ {% if site_version %}
+ <span class="site-version">{{ site_version }}</span>
+ {% endif %}
+ </h1>
+ {% endif %}
+ </header>
+
+ {% if page.sidebar_first %}
+ <aside class="layout-sidebar-first" role="complementary">
+ {{ page.sidebar_first }}
+ </aside>{# /.layout-sidebar-first #}
+ {% endif %}
+
+ <main role="main">
+ {% if title %}
+ <h2 class="heading-a">{{ title }}</h2>
+ {% endif %}
+ {{ page.highlighted }}
+ {{ page.content }}
+ </main>
+
+ {% if page.sidebar_second %}
+ <aside class="layout-sidebar-second" role="complementary">
+ {{ page.sidebar_second }}
+ </aside>{# /.layout-sidebar-second #}
+ {% endif %}
+
+ {% if page.page_bottom %}
+ <footer role="contentinfo">
+ {{ page.page_bottom }}
+ </footer>
+ {% endif %}
+
+</div>{# /.layout-container #}