diff --git a/src/calibre/gui2/palette.py b/src/calibre/gui2/palette.py
index d919154eec..9334013e5b 100644
--- a/src/calibre/gui2/palette.py
+++ b/src/calibre/gui2/palette.py
@@ -380,14 +380,23 @@ class PaletteManager(QObject):
 QTabBar::tab:selected {
     background-color: palette(base);
     border: 1px solid gray;
-    border-top-left-radius: 4px;
-    border-top-right-radius: 4px;
-    border-bottom-width: 0;
     padding: 2px 8px;
     margin-left: -4px;
     margin-right: -4px;
 }
 
+QTabBar::tab:top:selected {
+    border-top-left-radius: 4px;
+    border-top-right-radius: 4px;
+    border-bottom-width: 0;
+}
+
+QTabBar::tab:bottom:selected {
+    border-bottom-left-radius: 4px;
+    border-bottom-right-radius: 4px;
+    border-top-width: 0;
+}
+
 QTabBar::tab:first:selected {
     margin-left: 0; /* the first selected tab has nothing to overlap with on the left */
 }