diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 8f48b74..5def799 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2823,7 +2823,7 @@ function template_preprocess_page(&$variables) {
     }
   }
 
-  // Add mobile meta tags
+  // Add mobile meta tags.
   _theme_add_mobile_meta_tags();
 
   // Set up layout variable.
@@ -3041,7 +3041,7 @@ function template_preprocess_maintenance_page(&$variables) {
     drupal_add_html_head_link(array('rel' => 'shortcut icon', 'href' => drupal_strip_dangerous_protocols($favicon), 'type' => $type));
   }
 
-  // Add mobile meta tags
+  // Add mobile meta tags.
   _theme_add_mobile_meta_tags();
 
   // Get all region content set with drupal_add_region_content().
@@ -3144,14 +3144,13 @@ function template_process_maintenance_page(&$variables) {
 }
 
  /**
- * Preprocess variables for region.tpl.php
- * Prepare variables for install page templates.
+ * Preprocesses variables for region.tpl.php and for install page templates.
  *
  * Default template: install-page.html.twig
  *
  * @param array $variables
- *   An associative array containing:
- *   - @todo
+ *   An associative array containing variables to process.
+ *   @todo Specify the elements in the array.
  *
  * @see template_preprocess_maintenance_page()
  */
@@ -3167,6 +3166,7 @@ function template_preprocess_install_page(&$variables) {
  *
  * @see install-page.html.twig
  * @see template_process_html()
+ *
  * @todo Remove this function.
  */
 function template_process_install_page(&$variables) {
diff --git a/core/includes/theme.maintenance.inc b/core/includes/theme.maintenance.inc
index 09b731d..aec2932 100644
--- a/core/includes/theme.maintenance.inc
+++ b/core/includes/theme.maintenance.inc
@@ -115,7 +115,7 @@ function _theme_load_offline_registry($theme, $base_theme = NULL, $theme_engine
  *   An associative array containing:
  *   - items: An associative array of maintenance tasks.
  *   - active: The key for the currently active maintenance task.
- *   - variant: A variant name to be used for a CSS class
+ *   - variant: A variant name to be used for a CSS class.
  *
  * @ingroup themeable
  */
diff --git a/core/modules/system/css/system.maintenance.css b/core/modules/system/css/system.maintenance.css
index fe7d2fc..5e218dd 100644
--- a/core/modules/system/css/system.maintenance.css
+++ b/core/modules/system/css/system.maintenance.css
@@ -55,16 +55,16 @@
   background-color: #1275b2;
   background-image:
     url('images/noise-low.png'),
-    -webkit-radial-gradient( hsl(203, 80%, 45%), hsl(203, 80%, 32%) );
+    -webkit-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
   background-image:
     url('images/noise-low.png'),
-    -moz-radial-gradient( hsl(203, 80%, 45%), hsl(203, 80%, 32%) );
+    -moz-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
   background-image:
     url('images/noise-low.png'),
-    -o-radial-gradient( hsl(203, 80%, 45%), hsl(203, 80%, 32%) );
+    -o-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
   background-image:
     url('images/noise-low.png'),
-    radial-gradient( hsl(203, 80%, 45%), hsl(203, 80%, 32%) );
+    radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
   background-repeat: repeat;
   background-position: left top, 50% 50%;
   min-height: 100%;
diff --git a/core/themes/seven/install-page.css b/core/themes/seven/install-page.css
index b3e82db..22409c6 100644
--- a/core/themes/seven/install-page.css
+++ b/core/themes/seven/install-page.css
@@ -1,6 +1,9 @@
 /**
+ * @file
  * Installation styling.
- * Unfortunately we have to make our styling quite strong, to override the the .in-maintenance styling
+ *
+ * Unfortunately we have to make our styling quite strong, to override the the
+ * .in-maintenance styling
  */
 body.install-page {
     background: none;