diff --git a/copy_system_templates_2349759-21.patch b/copy_system_templates_2349759-21.patch
new file mode 100644
index 0000000..2467cdd
--- /dev/null
+++ b/copy_system_templates_2349759-21.patch
@@ -0,0 +1,317 @@
+diff --git a/core/modules/system/templates/admin-block-content.html.twig b/core/modules/system/templates/admin-block-content.html.twig
+index e70e565..025ba9c 100644
+--- a/core/modules/system/templates/admin-block-content.html.twig
++++ b/core/modules/system/templates/admin-block-content.html.twig
+@@ -16,14 +16,9 @@
+  * @ingroup themeable
+  */
+ #}
+-{%
+-  set classes = [
+-    'admin-list',
+-    compact ? 'compact',
+-  ]
+-%}
++
+ {% if content %}
+-  <dl{{ attributes.addClass(classes) }}>
++  <dl{{ attributes }}>
+     {% for item in content %}
+       <dt>{{ item.link }}</dt>
+       {% if item.description %}
+diff --git a/core/modules/system/templates/admin-block.html.twig b/core/modules/system/templates/admin-block.html.twig
+index 20aa000..542fe04 100644
+--- a/core/modules/system/templates/admin-block.html.twig
++++ b/core/modules/system/templates/admin-block.html.twig
+@@ -14,13 +14,13 @@
+  * @ingroup themeable
+  */
+ #}
+-<div class="admin-panel">
++<div>
+   {% if block.title %}
+     <h3>{{ block.title }}</h3>
+   {% endif %}
+   {% if block.content %}
+-    <div class="body">{{ block.content }}</div>
++    <div>{{ block.content }}</div>
+   {% elseif block.description %}
+-    <div class="description">{{ block.description }}</div>
++    <div>{{ block.description }}</div>
+   {% endif %}
+ </div>
+diff --git a/core/modules/system/templates/admin-page.html.twig b/core/modules/system/templates/admin-page.html.twig
+index 038b1af..8ed590a 100644
+--- a/core/modules/system/templates/admin-page.html.twig
++++ b/core/modules/system/templates/admin-page.html.twig
+@@ -14,10 +14,10 @@
+  * @ingroup themeable
+  */
+ #}
+-<div class="clearfix">
++<div>
+   {{ system_compact_link }}
+   {% for container in containers %}
+-    <div class="layout-column half">
++    <div>
+       {% for block in container.blocks %}
+         {{ block }}
+       {% endfor %}
+diff --git a/core/modules/system/templates/block--system-branding-block.html.twig b/core/modules/system/templates/block--system-branding-block.html.twig
+index 4cf0f1a..f045f5d 100644
+--- a/core/modules/system/templates/block--system-branding-block.html.twig
++++ b/core/modules/system/templates/block--system-branding-block.html.twig
+@@ -22,11 +22,11 @@
+     </a>
+   {% endif %}
+   {% if site_name %}
+-    <div class="site-name">
++    <div>
+       <a href="{{ url('<front>') }}" title="{{ 'Home'|t }}" rel="home">{{ site_name }}</a>
+     </div>
+   {% endif %}
+   {% if site_slogan %}
+-    <div class="site-slogan">{{ site_slogan }}</div>
++    <div>{{ site_slogan }}</div>
+   {% endif %}
+ {% endblock %}
+diff --git a/core/modules/system/templates/block--system-menu-block.html.twig b/core/modules/system/templates/block--system-menu-block.html.twig
+index dff7e39..72cc966 100644
+--- a/core/modules/system/templates/block--system-menu-block.html.twig
++++ b/core/modules/system/templates/block--system-menu-block.html.twig
+@@ -40,19 +40,12 @@
+  * @ingroup themeable
+  */
+ #}
+-{%
+-  set classes = [
+-    'block',
+-    'block-menu',
+-    'navigation',
+-    'menu--' ~ derivative_plugin_id|clean_class,
+-  ]
+-%}
++
+ {% set heading_id = attributes.id ~ '-menu'|clean_id %}
+-<nav{{ attributes.addClass(classes) }} role="navigation" aria-labelledby="{{ heading_id }}">
++<nav{{ attributes }} role="navigation" aria-labelledby="{{ heading_id }}">
+   {# Label. If not displayed, we still provide it for screen readers. #}
+   {% if not configuration.label_display %}
+-    {% set title_attributes = title_attributes.addClass('visually-hidden') %}
++    {% set title_attributes = title_attributes %}
+   {% endif %}
+   {{ title_prefix }}
+   <h2 id="{{ heading_id }}"{{ title_attributes }}>{{ configuration.label }}</h2>
+diff --git a/core/themes/classy/templates/admin-block-content.html.twig b/core/themes/classy/templates/admin-block-content.html.twig
+new file mode 100644
+index 0000000..e70e565
+--- /dev/null
++++ b/core/themes/classy/templates/admin-block-content.html.twig
+@@ -0,0 +1,34 @@
++{#
++/**
++ * @file
++ * Default theme implementation for the content of an administrative block.
++ *
++ * Available variables:
++ * - content: A list containing information about the block. Each element
++ *   of the array represents an administrative menu item, and must at least
++ *   contain the keys 'title', 'link_path', and 'localized_options', which are
++ *   passed to l(). A 'description' key may also be provided.
++ * - attributes: HTML attributes to be added to the element.
++ * - compact: Boolean indicating whether compact mode is turned on or not.
++ *
++ * @see template_preprocess_admin_block_content()
++ *
++ * @ingroup themeable
++ */
++#}
++{%
++  set classes = [
++    'admin-list',
++    compact ? 'compact',
++  ]
++%}
++{% if content %}
++  <dl{{ attributes.addClass(classes) }}>
++    {% for item in content %}
++      <dt>{{ item.link }}</dt>
++      {% if item.description %}
++        <dd>{{ item.description }}</dd>
++      {% endif %}
++    {% endfor %}
++  </dl>
++{% endif %}
+diff --git a/core/themes/classy/templates/admin-block.html.twig b/core/themes/classy/templates/admin-block.html.twig
+new file mode 100644
+index 0000000..20aa000
+--- /dev/null
++++ b/core/themes/classy/templates/admin-block.html.twig
+@@ -0,0 +1,26 @@
++{#
++/**
++ * @file
++ * Default theme implementation for an administrative block.
++ *
++ * Available variables:
++ * - block: An array of information about the block, including:
++ *   - show: A flag indicating if the block should be displayed.
++ *   - title: The block title.
++ *   - content: (optional) The content of the block.
++ *   - description: (optional) A description of the block.
++ *     (Description should only be output if content is not available).
++ *
++ * @ingroup themeable
++ */
++#}
++<div class="admin-panel">
++  {% if block.title %}
++    <h3>{{ block.title }}</h3>
++  {% endif %}
++  {% if block.content %}
++    <div class="body">{{ block.content }}</div>
++  {% elseif block.description %}
++    <div class="description">{{ block.description }}</div>
++  {% endif %}
++</div>
+diff --git a/core/themes/classy/templates/admin-page.html.twig b/core/themes/classy/templates/admin-page.html.twig
+new file mode 100644
+index 0000000..038b1af
+--- /dev/null
++++ b/core/themes/classy/templates/admin-page.html.twig
+@@ -0,0 +1,26 @@
++{#
++/**
++ * @file
++ * Default theme implementation for an administrative page.
++ *
++ * Available variables:
++ * - system_compact_link: Themed link to toggle compact view.
++ * - containers: An list of administrative blocks keyed by position: left or
++ *   right. Contains:
++ *   - blocks: A list of blocks within a container.
++ *
++ * @see template_preprocess_admin_page()
++ *
++ * @ingroup themeable
++ */
++#}
++<div class="clearfix">
++  {{ system_compact_link }}
++  {% for container in containers %}
++    <div class="layout-column half">
++      {% for block in container.blocks %}
++        {{ block }}
++      {% endfor %}
++    </div>
++  {% endfor %}
++</div>
+diff --git a/core/themes/classy/templates/block--system-branding-block.html.twig b/core/themes/classy/templates/block--system-branding-block.html.twig
+new file mode 100644
+index 0000000..4cf0f1a
+--- /dev/null
++++ b/core/themes/classy/templates/block--system-branding-block.html.twig
+@@ -0,0 +1,32 @@
++{% extends "@block/block.html.twig" %}
++{#
++/**
++ * @file
++ * Default theme implementation for a branding block.
++ *
++ * Each branding element variable (logo, name, slogan) is only available if
++ * enabled in the block configuration.
++ *
++ * Available variables:
++ * - site_logo: Logo for site as defined in Appearance or theme settings.
++ * - site_name: Name for site as defined in Site information settings.
++ * - site_slogan: Slogan for site as defined in Site information settings.
++ *
++ * @ingroup themeable
++ */
++#}
++{% block content %}
++  {% if site_logo %}
++    <a href="{{ url('<front>') }}" title="{{ 'Home'|t }}" rel="home" class="site-logo">
++      <img src="{{ site_logo }}" alt="{{ 'Home'|t }}" />
++    </a>
++  {% endif %}
++  {% if site_name %}
++    <div class="site-name">
++      <a href="{{ url('<front>') }}" title="{{ 'Home'|t }}" rel="home">{{ site_name }}</a>
++    </div>
++  {% endif %}
++  {% if site_slogan %}
++    <div class="site-slogan">{{ site_slogan }}</div>
++  {% endif %}
++{% endblock %}
+diff --git a/core/themes/classy/templates/block--system-menu-block.html.twig b/core/themes/classy/templates/block--system-menu-block.html.twig
+new file mode 100644
+index 0000000..dff7e39
+--- /dev/null
++++ b/core/themes/classy/templates/block--system-menu-block.html.twig
+@@ -0,0 +1,65 @@
++{#
++/**
++ * @file
++ * Default theme implementation for a menu block.
++ *
++ * Available variables:
++ * - plugin_id: The ID of the block implementation.
++ * - label: The configured label of the block if visible.
++ * - configuration: A list of the block's configuration values.
++ *   - label: The configured label for the block.
++ *   - label_display: The display settings for the label.
++ *   - module: The module that provided this block plugin.
++ *   - cache: The cache settings.
++ *   - Block plugin specific settings will also be stored here.
++ * - block - The full block entity.
++ *   - label_hidden: The hidden block title value if the block was
++ *     configured to hide the title ('label' is empty in this case).
++ *   - module: The module that generated the block.
++ *   - delta: An ID for the block, unique within each module.
++ *   - region: The block region embedding the current block.
++ * - content: The content of this block.
++ * - attributes: HTML attributes for the containing element.
++ *   - id: A valid HTML ID and guaranteed unique.
++ * - title_attributes: HTML attributes for the title element.
++ * - content_attributes: HTML attributes for the content element.
++ * - title_prefix: Additional output populated by modules, intended to be
++ *   displayed in front of the main title tag that appears in the template.
++ * - title_suffix: Additional output populated by modules, intended to be
++ *   displayed after the main title tag that appears in the template.
++ *
++ * Headings should be used on navigation menus that consistently appear on
++ * multiple pages. When this menu block's label is configured to not be
++ * displayed, it is automatically made invisible using the 'visually-hidden' CSS
++ * class, which still keeps it visible for screen-readers and assistive
++ * technology. Headings allow screen-reader and keyboard only users to navigate
++ * to or skip the links.
++ * See http://juicystudio.com/article/screen-readers-display-none.php and
++ * http://www.w3.org/TR/WCAG-TECHS/H42.html for more information.
++ *
++ * @ingroup themeable
++ */
++#}
++{%
++  set classes = [
++    'block',
++    'block-menu',
++    'navigation',
++    'menu--' ~ derivative_plugin_id|clean_class,
++  ]
++%}
++{% set heading_id = attributes.id ~ '-menu'|clean_id %}
++<nav{{ attributes.addClass(classes) }} role="navigation" aria-labelledby="{{ heading_id }}">
++  {# Label. If not displayed, we still provide it for screen readers. #}
++  {% if not configuration.label_display %}
++    {% set title_attributes = title_attributes.addClass('visually-hidden') %}
++  {% endif %}
++  {{ title_prefix }}
++  <h2 id="{{ heading_id }}"{{ title_attributes }}>{{ configuration.label }}</h2>
++  {{ title_suffix }}
++
++  {# Menu. #}
++  {% block content %}
++    {{ content }}
++  {% endblock %}
++</nav>
diff --git a/core/modules/system/templates/admin-block-content.html.twig b/core/modules/system/templates/admin-block-content.html.twig
index e70e565..025ba9c 100644
--- a/core/modules/system/templates/admin-block-content.html.twig
+++ b/core/modules/system/templates/admin-block-content.html.twig
@@ -16,14 +16,9 @@
  * @ingroup themeable
  */
 #}
-{%
-  set classes = [
-    'admin-list',
-    compact ? 'compact',
-  ]
-%}
+
 {% if content %}
-  <dl{{ attributes.addClass(classes) }}>
+  <dl{{ attributes }}>
     {% for item in content %}
       <dt>{{ item.link }}</dt>
       {% if item.description %}
diff --git a/core/modules/system/templates/admin-block.html.twig b/core/modules/system/templates/admin-block.html.twig
index 20aa000..542fe04 100644
--- a/core/modules/system/templates/admin-block.html.twig
+++ b/core/modules/system/templates/admin-block.html.twig
@@ -14,13 +14,13 @@
  * @ingroup themeable
  */
 #}
-<div class="admin-panel">
+<div>
   {% if block.title %}
     <h3>{{ block.title }}</h3>
   {% endif %}
   {% if block.content %}
-    <div class="body">{{ block.content }}</div>
+    <div>{{ block.content }}</div>
   {% elseif block.description %}
-    <div class="description">{{ block.description }}</div>
+    <div>{{ block.description }}</div>
   {% endif %}
 </div>
diff --git a/core/modules/system/templates/admin-page.html.twig b/core/modules/system/templates/admin-page.html.twig
index 038b1af..8ed590a 100644
--- a/core/modules/system/templates/admin-page.html.twig
+++ b/core/modules/system/templates/admin-page.html.twig
@@ -14,10 +14,10 @@
  * @ingroup themeable
  */
 #}
-<div class="clearfix">
+<div>
   {{ system_compact_link }}
   {% for container in containers %}
-    <div class="layout-column half">
+    <div>
       {% for block in container.blocks %}
         {{ block }}
       {% endfor %}
diff --git a/core/modules/system/templates/block--system-branding-block.html.twig b/core/modules/system/templates/block--system-branding-block.html.twig
index 4cf0f1a..f045f5d 100644
--- a/core/modules/system/templates/block--system-branding-block.html.twig
+++ b/core/modules/system/templates/block--system-branding-block.html.twig
@@ -22,11 +22,11 @@
     </a>
   {% endif %}
   {% if site_name %}
-    <div class="site-name">
+    <div>
       <a href="{{ url('<front>') }}" title="{{ 'Home'|t }}" rel="home">{{ site_name }}</a>
     </div>
   {% endif %}
   {% if site_slogan %}
-    <div class="site-slogan">{{ site_slogan }}</div>
+    <div>{{ site_slogan }}</div>
   {% endif %}
 {% endblock %}
diff --git a/core/modules/system/templates/block--system-menu-block.html.twig b/core/modules/system/templates/block--system-menu-block.html.twig
index dff7e39..72cc966 100644
--- a/core/modules/system/templates/block--system-menu-block.html.twig
+++ b/core/modules/system/templates/block--system-menu-block.html.twig
@@ -40,19 +40,12 @@
  * @ingroup themeable
  */
 #}
-{%
-  set classes = [
-    'block',
-    'block-menu',
-    'navigation',
-    'menu--' ~ derivative_plugin_id|clean_class,
-  ]
-%}
+
 {% set heading_id = attributes.id ~ '-menu'|clean_id %}
-<nav{{ attributes.addClass(classes) }} role="navigation" aria-labelledby="{{ heading_id }}">
+<nav{{ attributes }} role="navigation" aria-labelledby="{{ heading_id }}">
   {# Label. If not displayed, we still provide it for screen readers. #}
   {% if not configuration.label_display %}
-    {% set title_attributes = title_attributes.addClass('visually-hidden') %}
+    {% set title_attributes = title_attributes %}
   {% endif %}
   {{ title_prefix }}
   <h2 id="{{ heading_id }}"{{ title_attributes }}>{{ configuration.label }}</h2>
diff --git a/core/themes/classy/templates/admin-block-content.html.twig b/core/themes/classy/templates/admin-block-content.html.twig
new file mode 100644
index 0000000..e70e565
--- /dev/null
+++ b/core/themes/classy/templates/admin-block-content.html.twig
@@ -0,0 +1,34 @@
+{#
+/**
+ * @file
+ * Default theme implementation for the content of an administrative block.
+ *
+ * Available variables:
+ * - content: A list containing information about the block. Each element
+ *   of the array represents an administrative menu item, and must at least
+ *   contain the keys 'title', 'link_path', and 'localized_options', which are
+ *   passed to l(). A 'description' key may also be provided.
+ * - attributes: HTML attributes to be added to the element.
+ * - compact: Boolean indicating whether compact mode is turned on or not.
+ *
+ * @see template_preprocess_admin_block_content()
+ *
+ * @ingroup themeable
+ */
+#}
+{%
+  set classes = [
+    'admin-list',
+    compact ? 'compact',
+  ]
+%}
+{% if content %}
+  <dl{{ attributes.addClass(classes) }}>
+    {% for item in content %}
+      <dt>{{ item.link }}</dt>
+      {% if item.description %}
+        <dd>{{ item.description }}</dd>
+      {% endif %}
+    {% endfor %}
+  </dl>
+{% endif %}
diff --git a/core/themes/classy/templates/admin-block.html.twig b/core/themes/classy/templates/admin-block.html.twig
new file mode 100644
index 0000000..20aa000
--- /dev/null
+++ b/core/themes/classy/templates/admin-block.html.twig
@@ -0,0 +1,26 @@
+{#
+/**
+ * @file
+ * Default theme implementation for an administrative block.
+ *
+ * Available variables:
+ * - block: An array of information about the block, including:
+ *   - show: A flag indicating if the block should be displayed.
+ *   - title: The block title.
+ *   - content: (optional) The content of the block.
+ *   - description: (optional) A description of the block.
+ *     (Description should only be output if content is not available).
+ *
+ * @ingroup themeable
+ */
+#}
+<div class="admin-panel">
+  {% if block.title %}
+    <h3>{{ block.title }}</h3>
+  {% endif %}
+  {% if block.content %}
+    <div class="body">{{ block.content }}</div>
+  {% elseif block.description %}
+    <div class="description">{{ block.description }}</div>
+  {% endif %}
+</div>
diff --git a/core/themes/classy/templates/admin-page.html.twig b/core/themes/classy/templates/admin-page.html.twig
new file mode 100644
index 0000000..038b1af
--- /dev/null
+++ b/core/themes/classy/templates/admin-page.html.twig
@@ -0,0 +1,26 @@
+{#
+/**
+ * @file
+ * Default theme implementation for an administrative page.
+ *
+ * Available variables:
+ * - system_compact_link: Themed link to toggle compact view.
+ * - containers: An list of administrative blocks keyed by position: left or
+ *   right. Contains:
+ *   - blocks: A list of blocks within a container.
+ *
+ * @see template_preprocess_admin_page()
+ *
+ * @ingroup themeable
+ */
+#}
+<div class="clearfix">
+  {{ system_compact_link }}
+  {% for container in containers %}
+    <div class="layout-column half">
+      {% for block in container.blocks %}
+        {{ block }}
+      {% endfor %}
+    </div>
+  {% endfor %}
+</div>
diff --git a/core/themes/classy/templates/block--system-branding-block.html.twig b/core/themes/classy/templates/block--system-branding-block.html.twig
new file mode 100644
index 0000000..4cf0f1a
--- /dev/null
+++ b/core/themes/classy/templates/block--system-branding-block.html.twig
@@ -0,0 +1,32 @@
+{% extends "@block/block.html.twig" %}
+{#
+/**
+ * @file
+ * Default theme implementation for a branding block.
+ *
+ * Each branding element variable (logo, name, slogan) is only available if
+ * enabled in the block configuration.
+ *
+ * Available variables:
+ * - site_logo: Logo for site as defined in Appearance or theme settings.
+ * - site_name: Name for site as defined in Site information settings.
+ * - site_slogan: Slogan for site as defined in Site information settings.
+ *
+ * @ingroup themeable
+ */
+#}
+{% block content %}
+  {% if site_logo %}
+    <a href="{{ url('<front>') }}" title="{{ 'Home'|t }}" rel="home" class="site-logo">
+      <img src="{{ site_logo }}" alt="{{ 'Home'|t }}" />
+    </a>
+  {% endif %}
+  {% if site_name %}
+    <div class="site-name">
+      <a href="{{ url('<front>') }}" title="{{ 'Home'|t }}" rel="home">{{ site_name }}</a>
+    </div>
+  {% endif %}
+  {% if site_slogan %}
+    <div class="site-slogan">{{ site_slogan }}</div>
+  {% endif %}
+{% endblock %}
diff --git a/core/themes/classy/templates/block--system-menu-block.html.twig b/core/themes/classy/templates/block--system-menu-block.html.twig
new file mode 100644
index 0000000..dff7e39
--- /dev/null
+++ b/core/themes/classy/templates/block--system-menu-block.html.twig
@@ -0,0 +1,65 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a menu block.
+ *
+ * Available variables:
+ * - plugin_id: The ID of the block implementation.
+ * - label: The configured label of the block if visible.
+ * - configuration: A list of the block's configuration values.
+ *   - label: The configured label for the block.
+ *   - label_display: The display settings for the label.
+ *   - module: The module that provided this block plugin.
+ *   - cache: The cache settings.
+ *   - Block plugin specific settings will also be stored here.
+ * - block - The full block entity.
+ *   - label_hidden: The hidden block title value if the block was
+ *     configured to hide the title ('label' is empty in this case).
+ *   - module: The module that generated the block.
+ *   - delta: An ID for the block, unique within each module.
+ *   - region: The block region embedding the current block.
+ * - content: The content of this block.
+ * - attributes: HTML attributes for the containing element.
+ *   - id: A valid HTML ID and guaranteed unique.
+ * - title_attributes: HTML attributes for the title element.
+ * - content_attributes: HTML attributes for the content element.
+ * - title_prefix: Additional output populated by modules, intended to be
+ *   displayed in front of the main title tag that appears in the template.
+ * - title_suffix: Additional output populated by modules, intended to be
+ *   displayed after the main title tag that appears in the template.
+ *
+ * Headings should be used on navigation menus that consistently appear on
+ * multiple pages. When this menu block's label is configured to not be
+ * displayed, it is automatically made invisible using the 'visually-hidden' CSS
+ * class, which still keeps it visible for screen-readers and assistive
+ * technology. Headings allow screen-reader and keyboard only users to navigate
+ * to or skip the links.
+ * See http://juicystudio.com/article/screen-readers-display-none.php and
+ * http://www.w3.org/TR/WCAG-TECHS/H42.html for more information.
+ *
+ * @ingroup themeable
+ */
+#}
+{%
+  set classes = [
+    'block',
+    'block-menu',
+    'navigation',
+    'menu--' ~ derivative_plugin_id|clean_class,
+  ]
+%}
+{% set heading_id = attributes.id ~ '-menu'|clean_id %}
+<nav{{ attributes.addClass(classes) }} role="navigation" aria-labelledby="{{ heading_id }}">
+  {# Label. If not displayed, we still provide it for screen readers. #}
+  {% if not configuration.label_display %}
+    {% set title_attributes = title_attributes.addClass('visually-hidden') %}
+  {% endif %}
+  {{ title_prefix }}
+  <h2 id="{{ heading_id }}"{{ title_attributes }}>{{ configuration.label }}</h2>
+  {{ title_suffix }}
+
+  {# Menu. #}
+  {% block content %}
+    {{ content }}
+  {% endblock %}
+</nav>
diff --git a/core/themes/classy/templates/breadcrumb.html.twig b/core/themes/classy/templates/breadcrumb.html.twig
new file mode 100644
index 0000000..879e6f5
--- /dev/null
+++ b/core/themes/classy/templates/breadcrumb.html.twig
@@ -0,0 +1,27 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a breadcrumb trail.
+ *
+ * Available variables:
+ * - breadcrumb: Breadcrumb trail items.
+ *
+ * @ingroup themeable
+ */
+#}
+{% if breadcrumb %}
+  <nav role="navigation" aria-labelledby="system-breadcrumb">
+    <h2 id="system-breadcrumb">{{ 'Breadcrumb'|t }}</h2>
+    <ol>
+    {% for item in breadcrumb %}
+      <li>
+        {% if item.url %}
+          <a href="{{ item.url }}">{{ item.text }}</a>
+        {% else %}
+          {{ item.text }}
+        {% endif %}
+      </li>
+    {% endfor %}
+    </ol>
+  </nav>
+{% endif %}
diff --git a/core/themes/classy/templates/checkboxes.html.twig b/core/themes/classy/templates/checkboxes.html.twig
new file mode 100644
index 0000000..00384d3
--- /dev/null
+++ b/core/themes/classy/templates/checkboxes.html.twig
@@ -0,0 +1,17 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a 'checkboxes' #type form element.
+ *
+ * Available variables
+ * - attributes: A list of HTML attributes for the wrapper element.
+ * - children: The rendered checkboxes.
+ *
+ * @see template_preprocess_checkboxes()
+ *
+ * @ingroup themeable
+ */
+ @todo: remove this file once http://drupal.org/node/1819284 is resolved.
+ This is identical to core/modules/system/templates/container.html.twig
+#}
+<div{{ attributes }}>{{ children }}</div>
diff --git a/core/themes/classy/templates/confirm-form.html.twig b/core/themes/classy/templates/confirm-form.html.twig
new file mode 100644
index 0000000..d714917
--- /dev/null
+++ b/core/themes/classy/templates/confirm-form.html.twig
@@ -0,0 +1,15 @@
+{#
+/**
+ * @file
+ * Default theme implementation for confirm form.
+ *
+ * By default this does not alter the appearance of a form at all,
+ * but is provided as a convenience for themers.
+ *
+ * Available variables:
+ * - form: The confirm form.
+ *
+ * @ingroup themeable
+ */
+#}
+{{ form }}
diff --git a/core/themes/classy/templates/container.html.twig b/core/themes/classy/templates/container.html.twig
new file mode 100644
index 0000000..4e9af91
--- /dev/null
+++ b/core/themes/classy/templates/container.html.twig
@@ -0,0 +1,20 @@
+{#
+/**
+ * @file
+ * Default theme implementation of a container used to wrap child elements.
+ *
+ * Used for grouped form items. Can also be used as a #theme_wrapper for any
+ * renderable element, to surround it with a <div> and HTML attributes.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the containing element.
+ * - children: The rendered child elements of the container.
+ * - has_parent: A flag to indicate that the container has one or more parent
+     containers.
+ *
+ * @see template_preprocess_container()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes }}>{{ children }}</div>
diff --git a/core/themes/classy/templates/datetime-form.html.twig b/core/themes/classy/templates/datetime-form.html.twig
new file mode 100644
index 0000000..fef4b5e
--- /dev/null
+++ b/core/themes/classy/templates/datetime-form.html.twig
@@ -0,0 +1,17 @@
+{#
+/**
+ * @file
+ * Default theme implementation of a datetime form element.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the datetime form element.
+ * - content: The datelist form element to be output.
+ *
+ * @see template_preprocess_datetime_form()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes }}>
+  {{ content }}
+</div>
diff --git a/core/themes/classy/templates/datetime-wrapper.html.twig b/core/themes/classy/templates/datetime-wrapper.html.twig
new file mode 100644
index 0000000..ba18363
--- /dev/null
+++ b/core/themes/classy/templates/datetime-wrapper.html.twig
@@ -0,0 +1,25 @@
+{#
+/**
+ * @file
+ * Default theme implementation of a datetime form wrapper.
+ *
+ * Available variables:
+ * - content: The form element to be output, usually a datelist, or datetime.
+ * - title: The title of the form element.
+ * - title_attributes: HTML attributes for the title wrapper.
+ * - description: Description text for the form element.
+ * - required: An indicator for whether the associated form element is required.
+ *
+ * @see template_preprocess_datetime_wrapper()
+ *
+ * @ingroup themeable
+ */
+#}
+
+{% if title %}
+  <h4{{ title_attributes}}>{{ title }}</h4>
+{% endif %}
+{{ content }}
+{% if description %}
+  <div>{{ description }}</div>
+{% endif %}