diff --git a/theme/parts/tabsbar.css b/theme/parts/tabsbar.css
index b780f91..be3aa28 100644
--- a/theme/parts/tabsbar.css
+++ b/theme/parts/tabsbar.css
@@ -134,7 +134,7 @@ spacer[part=overflow-start-indicator], spacer[part=overflow-end-indicator] {
 	border-left-width: 1px !important;
 	border-color: transparent !important;
 }
-.tabbrowser-tab:not([first-visible-unpinned-tab], [selected], :hover) {
+.tabbrowser-tab:not(:first-of-type, [selected], :hover) {
 	--gnome-tabbar-tab-separator-hack0: var(--gnome-tabbar-background);
 	--gnome-tabbar-tab-separator-hack1: linear-gradient(
 		to bottom,
@@ -147,9 +147,12 @@ spacer[part=overflow-start-indicator], spacer[part=overflow-end-indicator] {
 	) 1;
 	border-image: var(--gnome-tabbar-tab-separator-hack1);
 }
-.tabbrowser-tab:not([first-visible-unpinned-tab]):-moz-window-inactive {
+.tabbrowser-tab:-moz-window-inactive {
 	--gnome-tabbar-tab-separator-hack0: var(--gnome-inactive-tabbar-background);
 }
+#tabbrowser-tabs[overflow="true"] .tabbrowser-tab[first-visible-unpinned-tab] {
+	border-image: none !important;
+}
 .tabbrowser-tab[selected] ~ .tabbrowser-tab:not([hidden="true"]) {
 	border-image: none;
 }