diff --git a/preview.css b/preview.css
index 530c93e..7aed949 100644
--- a/preview.css
+++ b/preview.css
@@ -1,6 +1,7 @@
 html {
   font: 3mm tahoma,arial,helvetica,sans-serif;
   background-color: rgb(240, 240, 240);
+  color: rgb(0, 0, 0);
   box-sizing: border-box;
 }