diff --git a/dev.less b/dev.less
index b98d625..4250453 100644
--- a/dev.less
+++ b/dev.less
@@ -107,3 +107,8 @@ body::before {
 #heatcalc, #heatcalc input{
     font-family: arial !important;
 }
+
+#hc_table th tr:first{
+    background: #000;
+    color:#fff;
+}