Bugfix: Moodle core Back-to-top button was not clickable over Boost Campus footer

CHANGES.md

@@ -6,6 +6,7 @@ Changes
 
 ### Unreleased
 
+* 2021-02-05 - Bugfix: Moodle core Back-to-top button was not clickable over Boost Campus footer
 * 2021-02-05 - Move Moodle Plugin CI from Travis CI to Github actions
 
 ### Release v3.10-r2

scss/post.scss

@@ -930,7 +930,14 @@ a[href^="mailto"]::before {
   Additional Elements
   -------------------------------------*/
 
-/* Back to top button */
+/* Moodle Core Back to top button */
+body.scrolled #goto-top-link {
+    /* For unknown reasons, the Moodle Core Back to top button is made unclickable by the Boost Campus footer.
+       We fix this by simply raising the z-index of the button. */
+    z-index: $zindex-tooltip;
+}
+
+/* Boost Campus Back to top button */
 #back-to-top {
     display: none;
     position: fixed;