Change sidebar and sidepanel text font size to 13px

assets/css/src/newsletter_editor/components/forms.styl

@@ -4,7 +4,6 @@
 
 .mailpoet_form_field_title
   clear: both
-  font-size: 1.1em
   margin-bottom: 5px
 
 .mailpoet_form_field_title_small

assets/css/src/newsletter_editor/components/sidebar.styl

@@ -17,6 +17,7 @@ $widget-icon-width = 30px
   border-left: $content-border-color
   border-bottom: $content-border-color
   color: $sidebar-text-color
+  font-size: 13px
 
   .mailpoet_sidebar_region
     margin-bottom: 0

assets/css/src/newsletter_editor/components/sidepanel.styl

@@ -3,6 +3,7 @@ $sidepanel-active-heading-color = $primary-active-color
 /* Sidepanel */
 .mailpoet_editor_settings
   color: $sidebar-text-color
+  font-size: 13px
 
   p
     font-size: 1em
@@ -18,7 +19,6 @@ $sidepanel-active-heading-color = $primary-active-color
 
 .mailpoet_sidepanel_field_title
   clear: both
-  font-size: 1.1em
   margin-bottom: 5px
 
 .mailpoet_sidepanel_field_title_small