add options for highlighting first line in reader, controlling reader update rate

reader.html

@@ -8,7 +8,7 @@
 body
 {
     background-color: #111;
-    color: #CCC;
+    color: #E0E0E0;
     font-family: Verdana, Arial, IPAGothic, Noto Sans CJK JP Regular, TakaoGothic, Meiryo, sans-serif;
     font-size: 1.4em;
 }
@@ -22,6 +22,12 @@ p
     margin-bottom: 5px;
 }
 </style>
+<style id=new_color_style>
+body > p:nth-of-type(1)
+{
+    color: #CCCCCC;
+}
+</style>
 <script src="include/browser-polyfill.min.js" charset="UTF-8"></script>
 <script src="reader.js" charset="UTF-8"></script>
 <script src="texthook.js" charset="UTF-8"></script>