Reorganized css style statements

resources/chat/template.html

@@ -4,15 +4,12 @@
     <meta http-equiv="content-type" content="text/html; charset=utf-8" />
     <base href="{base_url}">
 
-    <style type="text/css">
+    <!-- Settings common to all styles !-->
+    <style id="base_style" type="text/css" media="screen,print">
       * {{ word-wrap: break-word; text-rendering: optimizelegibility; }}
       img.scaled-to-fit {{ height: auto; max-width: 100%; }}
     </style>
 
-    <!-- This style is shared by all variants. !-->
-    <style id="base_style" type="text/css" media="screen,print">
-    </style>
-
     <!-- The selected style !-->
     <style id="main_style" type="text/css" media="screen,print">
       @import url("{style_url}");