fix toc styling error

Author: fantasai

css3-text/Overview.src.html

@@ -328,7 +328,7 @@ <h2 class="no-num no-toc" id="contents">Table of Contents</h2>
     <ul class="toc">
       <li><a href="#line-decoration"><span class="secno">8.1.</span>
         Line Decoration: Underline, Overline, and Strike-Through</a>
-        <ul>
+        <ul class="toc">
         <li><a href="#text-decoration-line"><span class="secno">8.1.1</span>
           Text Decoration Lines: the 'text-decoration-line' property</a>
         <li><a href="#text-decoration-color"><span class="secno">8.1.2</span>