update Tabs card demo

components/tabs/demo/card-top.md

@@ -34,7 +34,10 @@ ReactDOM.render(
   margin-top: -16px;
 }
 
-.card-container > .ant-tabs-card > .ant-tabs-bar .ant-tabs-bar,
+.card-container > .ant-tabs-card > .ant-tabs-bar .ant-tabs-tab {
+  border-color: transparent;
+}
+
 .card-container > .ant-tabs-card > .ant-tabs-bar .ant-tabs-tab-active {
   border-color: #fff;
 }

components/tabs/style/index.less

@@ -379,7 +379,7 @@
   }
   &&-card > &-bar &-tab {
     margin: 0;
-    border: 1px solid transparent;
+    border: 1px solid @border-color-base;
     border-bottom: 0;
     border-radius: 6px 6px 0 0;
     transition: all 0.3s @ease-in-out;