diff --git a/app/assets/javascripts/admin/templates/customize_css_html.js.handlebars b/app/assets/javascripts/admin/templates/customize_css_html.js.handlebars
index 3323c13ba56..879ca8aaf87 100644
--- a/app/assets/javascripts/admin/templates/customize_css_html.js.handlebars
+++ b/app/assets/javascripts/admin/templates/customize_css_html.js.handlebars
@@ -51,9 +51,11 @@
     <span>{{i18n admin.customize.override_default}} {{view Ember.Checkbox checkedBinding="selectedItem.override_default_style"}}</span>
     <span>{{i18n admin.customize.enabled}}  {{view Ember.Checkbox checkedBinding="selectedItem.enabled"}}</span>
     {{#unless selectedItem.changed}}
-    <a class='preview-link' {{bind-attr href="selectedItem.previewUrl"}} target='_blank'>{{i18n admin.customize.preview}}</a>
+    <a class='preview-link' {{bind-attr href="selectedItem.previewUrl"}} target='_blank' title="{{i18n admin.customize.explain_preview}}">{{i18n admin.customize.preview}}</a>
     |
-    <a href="/?preview-style=" target='_blank'>{{i18n admin.customize.undo_preview}}</a><br>
+    <a href="/?preview-style=" target='_blank' title="{{i18n admin.customize.explain_undo_preview}}">{{i18n admin.customize.undo_preview}}</a>
+    |
+    <a href="/?preview-style=default" target='_blank' title="{{i18n admin.customize.explain_rescue_preview}}">{{i18n admin.customize.rescue_preview}}</a><br>
     {{/unless}}
   </div>
 
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 5a662c90e49..e73786f58ba 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -163,7 +163,13 @@ class ApplicationController < ActionController::Base
 
   def inject_preview_style
     style = request['preview-style']
-    session[:preview_style] = style if style
+    if style.blank?
+      session[:preview_style] = nil
+    elsif style == "default"
+      session[:preview_style] = ""
+    else
+      session[:preview_style] = style
+    end
   end
 
   def disable_customization
diff --git a/config/locales/client.en.yml b/config/locales/client.en.yml
index a4abbb047db..22c5b5fad4c 100644
--- a/config/locales/client.en.yml
+++ b/config/locales/client.en.yml
@@ -1505,7 +1505,11 @@ en:
         override_default: "Do not include standard style sheet"
         enabled: "Enabled?"
         preview: "preview"
-        undo_preview: "undo preview"
+        undo_preview: "remove preview"
+        rescue_preview: "default style"
+        explain_preview: "See the site with this custom stylesheet"
+        explain_undo_preview: "Go back to the currently enabled custom stylesheet"
+        explain_rescue_preview: "See the site with the default stylesheet"
         save: "Save"
         new: "New"
         new_style: "New Style"