diff --git a/theme/boost/scss/moodle/modules.scss b/theme/boost/scss/moodle/modules.scss
index 971c1879b8d..5218e74732c 100644
--- a/theme/boost/scss/moodle/modules.scss
+++ b/theme/boost/scss/moodle/modules.scss
@@ -1275,7 +1275,7 @@ div#dock {
     position: sticky;
     justify-content: end;
     top: $navbar-height + 5px;
-    z-index: $zindex-modal;
+    z-index: $zindex-sticky;
     #quiz-timer {
         border: $border-width solid $red;
         background-color: $white;
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index 5c463f5b298..59f212a7711 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -17572,7 +17572,7 @@ div#dock {
   position: sticky;
   justify-content: end;
   top: 55px;
-  z-index: 1050; }
+  z-index: 1020; }
   #quiz-timer-wrapper #quiz-timer {
     border: 1px solid #ca3120;
     background-color: #fff; }
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index bdd68f17b0e..cf7cc900ff4 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -17799,7 +17799,7 @@ div#dock {
   position: sticky;
   justify-content: end;
   top: 55px;
-  z-index: 1050; }
+  z-index: 1020; }
   #quiz-timer-wrapper #quiz-timer {
     border: 1px solid #ca3120;
     background-color: #fff; }