diff --git a/css/swad16.105.css b/css/swad16.105.3.css
similarity index 99%
rename from css/swad16.105.css
rename to css/swad16.105.3.css
index 03e358e9c..f6d1065ca 100644
--- a/css/swad16.105.css
+++ b/css/swad16.105.3.css
@@ -1684,7 +1684,7 @@ a:hover img.CENTRE_PHOTO_SHOW
 	{
 	opacity:0.6;
 	}
-.ICO_HIGHLIGHT:hover, .CHECKBOX_CHECKED
+.ICO_HIGHLIGHT:hover, .CHECKBOX_UNCHECKED:hover, .CHECKBOX_CHECKED
 	{
 	opacity:1;
 	}
diff --git a/swad_changelog.h b/swad_changelog.h
index d74f38908..382f6911a 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -188,13 +188,14 @@
 /****************************** Public constants *****************************/
 /*****************************************************************************/
 
-#define Log_PLATFORM_VERSION	"SWAD 16.105.2 (2016-12-20)"
-#define CSS_FILE		"swad16.105.css"
+#define Log_PLATFORM_VERSION	"SWAD 16.105.3 (2016-12-20)"
+#define CSS_FILE		"swad16.105.3.css"
 #define JS_FILE			"swad16.101.js"
 
 // Number of lines (includes comments but not blank lines) has been got with the following command:
 // nl swad*.c swad*.h css/swad*.css py/swad*.py js/swad*.js soap/swad*?.h sql/swad*.sql | tail -1
 /*
+        Version 16.105.3: Dec 20, 2016	Changes in contextual checkboxes. (211280 lines)
         Version 16.105.2: Dec 20, 2016	Changes in behaviour of labels in forms. (211279 lines)
         Version 16.105.1: Dec 20, 2016	Changes in behaviour of labels in forms. (211244 lines)
         Version 16.105:   Dec 20, 2016	Changes in behaviour of labels in forms.
diff --git a/swad_group.c b/swad_group.c
index 9022e45a6..341fcfab2 100644
--- a/swad_group.c
+++ b/swad_group.c
@@ -261,7 +261,7 @@ void Grp_ShowFormToSelectSeveralGroups (Act_Action_t NextAction)
       Usr_PutExtraParamsUsrList (NextAction);
 
       /***** Select all groups *****/
-      fprintf (Gbl.F.Out,"<div class=\"%s CENTER_MIDDLE\">"
+      fprintf (Gbl.F.Out,"<div class=\"CONTEXT_OPT %s\">"
                          "<label>"
 			 "<input type=\"checkbox\""
 			 " id=\"AllGroups\" name=\"AllGroups\" value=\"Y\"",