Add focus style back to css

Just for easier debugging of focus

src/app.css

@@ -2,3 +2,9 @@
 @tailwind base;
 @tailwind components;
 @tailwind utilities;
+
+/* This was removed from preflight, but turning it back on for better testing */
+button:focus {
+  outline: 1px dotted;
+  outline: 5px auto -webkit-focus-ring-color;
+}