diff --git a/extensions/flags/less/forum.less b/extensions/flags/less/forum.less
index 4ba42eacfe..13eaa52353 100644
--- a/extensions/flags/less/forum.less
+++ b/extensions/flags/less/forum.less
@@ -1,8 +1,8 @@
-:root {
+[data-theme=light] {
   .light-contents-vars(@color: @body-bg-light; @control-color: @body-bg-light; @name: 'flagged-post');
 }
 
-[data-theme=dark]:root {
+[data-theme=dark] {
   .light-contents-vars(@color: @body-bg-dark; @control-color: @body-bg-dark; @name: 'flagged-post');
 }
 
diff --git a/extensions/tags/less/forum/ToggleButton.less b/extensions/tags/less/forum/ToggleButton.less
index d0198a12fd..5d48b14bcf 100644
--- a/extensions/tags/less/forum/ToggleButton.less
+++ b/extensions/tags/less/forum/ToggleButton.less
@@ -1,8 +1,8 @@
-:root {
+[data-theme=light] {
   .Button--color-vars(@control-bg-light, @control-color-light, 'button-toggled');
 }
 
-[data-theme=dark]:root {
+[data-theme=dark] {
   .Button--color-vars(@control-bg-dark, @control-color-dark, 'button-toggled');
 }