update tabs style

style/components/tabs.less

@@ -325,7 +325,7 @@
       }
     }
     .@{tab-prefix-cls}-tabs-bar {
-      border-right: 1px solid #e9e9e9;
+      border-right: 1px solid @border-color-split;
       margin-right: -1px;
     }
     .@{tab-prefix-cls}-nav-container {
@@ -339,14 +339,14 @@
     }
     .@{tab-prefix-cls}-content {
       padding-left: 24px;
-      border-left: 1px solid #e9e9e9;
+      border-left: 1px solid @border-color-split;
     }
   }
 
   &-vertical&-right {
     .@{tab-prefix-cls}-tabs-bar {
       float: right;
-      border-left: 1px solid #e9e9e9;
+      border-left: 1px solid @border-color-split;
       margin-left: -1px;
     }
     .@{tab-prefix-cls}-nav-container {
@@ -360,7 +360,7 @@
     }
     .@{tab-prefix-cls}-content {
       padding-right: 24px;
-      border-right: 1px solid #e9e9e9;
+      border-right: 1px solid @border-color-split;
     }
   }
 
@@ -371,6 +371,7 @@
   }
   &&-card &-nav {
     border-left: 1px solid @border-color-base;
+    border-radius: 2px 0 0 0;
   }
   &&-card &-tab {
     margin: 0;