Notebook toolbar styling

src/notebook/theme.css

@@ -154,8 +154,6 @@
 .jp-NBToolbar {
     display: flex;
     flex-direction: row;
-    background-color: #F8F8F8;
-    border-top: 1px solid #E0E0E0;
     border-bottom: 1px solid #E0E0E0;
     height: 24px;
 }
@@ -181,11 +179,12 @@
 
 
 .jp-NBToolbar-item.jp-NBToolbar-cellType {
-    border-left: 1px solid #E0E0E0;
-    border-right: 1px solid #E0E0E0;
     flex-basis: 100px;
 }
 
+.jp-NBToolbar-item.jp-NBToolbar-cellType select {
+    background: #FFFFFF;
+}
 
 .jp-NBToolbar-cellType .jp-NBToolbar-cellTypeDropdown {
     border: none;