diff --git a/index.html b/index.html
index e8f778c..bfae591 100644
--- a/index.html
+++ b/index.html
@@ -487,7 +487,7 @@
       const val = document.getElementById('theme-select').value;
       let url = slug + '/';
       if (val) url += '?theme=' + encodeURIComponent('../themes/' + val);
-      window.location.href = url;
+      window.open(url, '_blank');
     }
   </script>
 </body>