Forcing empty background

main/exercice/exercise_result.php

@@ -79,6 +79,11 @@ if ($origin != 'learnpath') {
 	// So we are not in learnpath tool
 	Display::display_header($nameTools, get_lang('Exercise'));
 } else {
+    $htmlHeadXtra[] = "
+    <style>
+    body { background: none;}
+    </style>
+    ";
     Display::display_reduced_header();
 }
 

main/exercice/exercise_show.php

@@ -123,6 +123,11 @@ $this_section = SECTION_COURSES;
 if ($origin != 'learnpath') {
 	Display::display_header('');
 } else {
+    $htmlHeadXtra[] = "
+    <style>
+    body { background: none;}
+    </style>
+    ";
 	Display::display_reduced_header();
 }
 ?>

main/exercice/result.php

@@ -62,6 +62,11 @@ if ($show_headers) {
 	$this_section = SECTION_COURSES;
 	Display::display_header();
 } else {
+    $htmlHeadXtra[] = "
+    <style>
+    body { background: none;}
+    </style>
+    ";
 	Display::display_reduced_header();
 }