span.title fix

[SVN r23399]

doc/html/boostbook.css

@@ -81,6 +81,13 @@ i.firstterm
       background-color: lightskyblue;
    }
 
+   span.title 
+   {
+     background-color: white;
+     font-size: 100%;
+     font-weight: normal;
+   }
+
    .section .section .title, .chapter .section .title, .table .title
    {
       background-color: white;