Merge pull request #252 from wdporter/main

add serif font stack

Author: kevquirk

simple.css

@@ -4,6 +4,7 @@
   --sans-font: -apple-system, BlinkMacSystemFont, "Avenir Next", Avenir,
     "Nimbus Sans L", Roboto, "Noto Sans", "Segoe UI", Arial, Helvetica,
     "Helvetica Neue", sans-serif;
+  --serif-font: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
   --mono-font: Consolas, Menlo, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
   --standard-border-radius: 5px;
   --border-width: 1px;