Update

Former-commit-id: 25e4b89053

home/system/theme/gtk/gtk-3.20/widgets/combobox.css

@@ -0,0 +1,47 @@
+/**************
+ * ComboBoxes *
+ **************/
+combobox arrow {
+    -gtk-icon-source: -gtk-icontheme("pan-down-symbolic");
+    min-height: 16px;
+    min-width: 16px;
+}
+
+combobox menu,
+combobox .menu {
+    padding: 2px 0;
+}
+
+combobox menu menuitem,
+combobox .menu menuitem {
+    min-height: 28px;
+    padding: 0 10px;
+}
+
+combobox menu menuitem:hover {
+    background-color: @selected_bg_color;
+}
+
+combobox:drop(active) {
+    box-shadow: none;
+}
+
+.linked:not(.vertical) > combobox:first-child > box > button.combo {
+    border-radius: 3px 0 0 3px;
+    margin-right: 1px;
+}
+
+.linked:not(.vertical) > combobox:last-child > box > button.combo {
+    border-radius: 0 3px 3px 0;
+    margin-left: 1px;
+}
+
+.linked:not(.vertical) > combobox:not(:first-child):not(:last-child) > box > button.combo {
+    border-radius: 0;
+    margin-left: 1px;
+    margin-right: 1px;
+}
+
+.linked:not(.vertical) > combobox > box > button.combo {
+	border-radius: 0;
+}