diff --git a/theme/boost/scss/moodle/core.scss b/theme/boost/scss/moodle/core.scss
index 2bfa166876b95..cc1ed116c97b1 100644
--- a/theme/boost/scss/moodle/core.scss
+++ b/theme/boost/scss/moodle/core.scss
@@ -48,13 +48,7 @@ $gototop-bottom-position: 50px !default;
     opacity: 0;
     transition: opacity .7s ease 0s, visibility .1s ease .8s;
     display: block;
-    position: fixed; /* IE compatibility hack */
-    @supports (position: sticky) {
-        position: sticky;
-    }
-    @supports (-ms-ime-align:auto) {
-        position: fixed; /* Edge compatibility hack */
-    }
+    position: fixed;
     bottom: $gototop-bottom-position;
     right: 0;
     a {
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index 5dda75a93fa62..094f88a63658f 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -9663,16 +9663,8 @@ input[disabled] {
   transition: opacity .7s ease 0s, visibility .1s ease .8s;
   display: block;
   position: fixed;
-  /* IE compatibility hack */
   bottom: 50px;
   right: 0; }
-  @supports (position: sticky) {
-    #goto-top-link {
-      position: sticky; } }
-  @supports (-ms-ime-align: auto) {
-    #goto-top-link {
-      position: fixed;
-      /* Edge compatibility hack */ } }
   #goto-top-link a {
     position: absolute;
     right: 0;
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index ab07c5f1a5dcc..42e504b4211f4 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -9868,16 +9868,8 @@ input[disabled] {
   transition: opacity .7s ease 0s, visibility .1s ease .8s;
   display: block;
   position: fixed;
-  /* IE compatibility hack */
   bottom: 50px;
   right: 0; }
-  @supports (position: sticky) {
-    #goto-top-link {
-      position: sticky; } }
-  @supports (-ms-ime-align: auto) {
-    #goto-top-link {
-      position: fixed;
-      /* Edge compatibility hack */ } }
   #goto-top-link a {
     position: absolute;
     right: 0;