doc: Tweak CSS

Tweak CSS a bit to match latest similar changes to web site style.  Also
move some CSS out of the HTML to the stylesheet so that the web site
stylesheet can override it.  This should ensure that notes and such are
back to being centered.

doc/src/sgml/stylesheet.css

@@ -25,6 +25,11 @@ h2 {
 	font-size: 1.2em;
 	margin: 1.2em 0em 1.2em 0em;
 	font-weight: bold;
+	color: #666;
+}
+
+.titlepage h2.title,
+.refnamediv h2 {
 	color: #EC5800;
 }
 
@@ -71,6 +76,19 @@ div.example {
 	margin: 0.5ex;
 }
 
+/* Put these here instead of inside the HTML (see unsetting of
+   admon.style in XSL) so that the web site stylesheet can set its own
+   style. */
+
+.tip,
+.note,
+.important,
+.caution,
+.warning {
+	margin-left: 0.5in;
+	margin-right: 0.5in;
+}
+
 /* miscellaneous */
 
 pre.literallayout, .screen, .synopsis, .programlisting {

doc/src/sgml/stylesheet.xsl

@@ -16,6 +16,7 @@
 <xsl:param name="generate.legalnotice.link" select="1"></xsl:param>
 <xsl:param name="chunk.first.sections" select="1"/>
 <xsl:param name="chunk.quietly" select="1"></xsl:param>
+<xsl:param name="admon.style"></xsl:param>  <!-- handled by CSS stylesheet -->
 
 <xsl:param name="website.stylesheet" select="0"/>