diff --git a/dev.less b/dev.less
index 841b3cd..1d9441e 100644
--- a/dev.less
+++ b/dev.less
@@ -129,12 +129,12 @@ display: block !important;
         tbody th{
             z-index: 100;
         }
-        tr:first-child th{
+        thead tr:first-child th{
             background-color: #000;
             color:#fff;
             border-color: #fff;
         }
-        tr:nth-child(1) th{
+        thead tr:nth-child(2thead ) th{
             background-color: #ff0;
             border-color: #fff;
         }