diff --git a/lib/templates/showmore.mustache b/lib/templates/showmore.mustache
index 2f26c5f07d3..ecd339c1b36 100644
--- a/lib/templates/showmore.mustache
+++ b/lib/templates/showmore.mustache
@@ -31,7 +31,7 @@
 <div class="showmore-container collapsed {{$extraclasses}}{{extraclasses}}{{/extraclasses}}" data-region="showmore">
     <button
         type="button"
-        class="btn btn-sm btn-link p-0 {{$buttonextraclasses}}{{buttonextraclasses}}{{/buttonextraclasses}}"
+        class="showmore-button btn btn-sm btn-link p-0 {{$buttonextraclasses}}{{buttonextraclasses}}{{/buttonextraclasses}}"
         aria-expanded="false"
         data-action="toggle-content"
     >
diff --git a/theme/boost/scss/moodle/core.scss b/theme/boost/scss/moodle/core.scss
index 1c03a712db7..328679749a8 100644
--- a/theme/boost/scss/moodle/core.scss
+++ b/theme/boost/scss/moodle/core.scss
@@ -3080,11 +3080,9 @@ blockquote {
             display: none;
         }
     }
-    button {
+    .showmore-button {
         float: right;
-        &.btn-link {
-            text-decoration: none;
-        }
+        text-decoration: none;
         .icon {
             font-size: $btn-font-size-sm;
             margin: 0;
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index 1da3bfcb184..e1f6d006897 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -28533,13 +28533,11 @@ blockquote {
 .showmore-container:not(.collapsed) .collapsed-content {
   display: none;
 }
-.showmore-container button {
+.showmore-container .showmore-button {
   float: right;
-}
-.showmore-container button.btn-link {
   text-decoration: none;
 }
-.showmore-container button .icon {
+.showmore-container .showmore-button .icon {
   font-size: 0.8203125rem;
   margin: 0;
 }
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index 13b633ed5fa..67599812ef9 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -28533,13 +28533,11 @@ blockquote {
 .showmore-container:not(.collapsed) .collapsed-content {
   display: none;
 }
-.showmore-container button {
+.showmore-container .showmore-button {
   float: right;
-}
-.showmore-container button.btn-link {
   text-decoration: none;
 }
-.showmore-container button .icon {
+.showmore-container .showmore-button .icon {
   font-size: 0.8203125rem;
   margin: 0;
 }