diff --git a/chrome/curved_tabs.css b/chrome/curved_tabs.css
index 4c5c111..7e59091 100644
--- a/chrome/curved_tabs.css
+++ b/chrome/curved_tabs.css
@@ -34,7 +34,10 @@ See the above repository for updates as well as full license text. */
 }
 
 .tabbrowser-tab[selected] > stack::before,
-.tabbrowser-tab[selected] > stack::after{ fill: var(--toolbar-bgcolor) !important; stroke: var(--tabs-border-color,transparent); }
+.tabbrowser-tab[selected] > stack::after{
+  fill: var(--lwt-selected-tab-background-color,var(--toolbar-bgcolor)) !important;
+  stroke: var(--tabs-border-color,transparent);
+}
 
 .tabbrowser-tab:hover > stack::after,
 .tabbrowser-tab[selected] > stack::after{