MDLSITE-8074 Fix broken collapsible section

Author: mudrd8mz

renderer.php

@@ -283,7 +283,7 @@ protected function collapsible_stage_tool($title, $content, $helpicon = '', $exp
 
         $attr['aria-controls'] = html_writer::random_id('collapse_');
         $attr['data-bs-toggle'] = 'collapse';
-        $attr['data-target'] = '#'.$attr['aria-controls'];
+        $attr['data-bs-target'] = '#'.$attr['aria-controls'];
 
         $output = html_writer::start_div('stagetool '.$extraclasses);
         $output .= html_writer::div(

scss/stage.scss

@@ -12,7 +12,7 @@
         .stagetool-title {
             font-size: larger;
             background: url([[pix:core|t/expanded]]) no-repeat scroll 0 center;
-            padding-left: 20px;
+            padding-left: 2rem;
             cursor: pointer;
             color: $link-color;
             text-decoration: $link-decoration;