exp: Remove column name background

ui/src/plugins/dev.perfetto.ExplorePage/query_builder/node_styling_widgets.scss

diff --git a/ui/src/plugins/dev.perfetto.ExplorePage/query_builder/node_styling_widgets.scss b/ui/src/plugins/dev.perfetto.ExplorePage/query_builder/node_styling_widgets.scss
index c86b4f7..edcb471 100644
--- a/ui/src/plugins/dev.perfetto.ExplorePage/query_builder/node_styling_widgets.scss
+++ b/ui/src/plugins/dev.perfetto.ExplorePage/query_builder/node_styling_widgets.scss
@@ -53,7 +53,6 @@
   font-family: var(--pf-font-monospace);
   font-size: 0.9em;
   font-weight: 600;
-  background-color: var(--pf-color-background-secondary);
   border-radius: 3px;
   color: var(--pf-color-text);
 }