[improvement] Tag: add type className (#3788)

src/style/var.less

@@ -571,6 +571,11 @@
 @tag-text-color: @white;
 @tag-border-radius: .2em;
 @tag-round-border-radius: .8em;
+@tag-dander-color: @red;
+@tag-primary-color: @blue;
+@tag-success-color: @green;
+@tag-default-color: @gray-dark;
+@tag-plain-background-color: @white;
 
 // Toast
 @toast-max-width: 70%;