diff --git a/css/leptonChrome.css b/css/leptonChrome.css
index 430310c..b15f1b0 100644
--- a/css/leptonChrome.css
+++ b/css/leptonChrome.css
@@ -7205,7 +7205,7 @@
       --uc-sound-tab-no-icon-label-position-x: 3px;
     }
     .tabbrowser-tab .tab-label-container[labeldirection="rtl"],
-    .tabbrowser-tab .tab-label-container :not([labeldirection]):-moz-locale-dir(rtl) {
+    .tabbrowser-tab .tab-label-container:not([labeldirection]):-moz-locale-dir(rtl) {
       --uc-sound-tab-no-icon-position-x: 0.5px;
       --uc-sound-tab-no-icon-label-position-x: -3px;
     }
diff --git a/src/tab/sound_tab/_show_with_favicons.scss b/src/tab/sound_tab/_show_with_favicons.scss
index a521b62..5f49f83 100644
--- a/src/tab/sound_tab/_show_with_favicons.scss
+++ b/src/tab/sound_tab/_show_with_favicons.scss
@@ -102,7 +102,7 @@
         --uc-sound-tab-no-icon-label-position-x: 3px;
       }
       &[labeldirection=rtl],
-      :not([labeldirection]):-moz-locale-dir(rtl) {
+      &:not([labeldirection]):-moz-locale-dir(rtl) {
         --uc-sound-tab-no-icon-position-x: 0.5px;
         --uc-sound-tab-no-icon-label-position-x: -3px;
       }