Fixed html css path

doc/docbook/styles/html/docbook.xsl

@@ -30,7 +30,7 @@
                      HTML Settings
     ################################################### -->   
 
-    <xsl:param name="html.stylesheet">../styles/html.css</xsl:param>
+    <xsl:param name="html.stylesheet">html.css</xsl:param>
 
     <!-- These extensions are required for table printing and other stuff -->
     <xsl:param name="use.extensions">1</xsl:param>