add comment that points out exact color styling

ts-themes-tailwind.html

@@ -4,6 +4,16 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
   <title>Time Safari Theme Switcher</title>
+  <!--
+   Here is the CSS styling for our theme "Optimistic Calm".
+   {
+     --bg: #FAFAFA,
+     --text: #3E4C59,
+     --primary: #D0F0EF,
+     --accent: #E2725B,
+     --highlight: #6699CC
+   }
+  -->
   <style>
     :root {
       --bg: #ffffff;