修改样式

public/static/theme/css/_custom.less

@@ -143,6 +143,11 @@
     border-radius: 2px;
   }
 
+  &-ss {
+    width: 20px;
+    height: 20px;
+  }
+
   &-xs {
     width: 26px;
     height: 26px;