diff --git a/nummi/main/static/main/css/plot.css b/nummi/main/static/main/css/plot.css
index a3db30c..4109c6b 100644
--- a/nummi/main/static/main/css/plot.css
+++ b/nummi/main/static/main/css/plot.css
@@ -3,6 +3,9 @@
 	width: 100%;
 	table-layout: auto;
 }
+.plot thead {
+	background: var(--bg-01);
+}
 .plot col.desc, .plot col.value {width: 8rem}
 .plot col.icon {width: 1ch}
 .plot tr {