diff --git a/xsl/xhtml5.xsl b/xsl/xhtml5.xsl
index 54ee71975..c70efa2aa 100644
--- a/xsl/xhtml5.xsl
+++ b/xsl/xhtml5.xsl
@@ -360,6 +360,13 @@
 	    background: url('<xsl:value-of select="content-image"/>') 50% 50% no-repeat;
 	  </xsl:attribute>
 	</xsl:if>
+	<xsl:if test="@class = 'wiki'">
+	  <xsl:attribute name="style">
+	    background-color: rgb(<xsl:value-of select="240 - 3 *
+	    string-length(content-text)"/>, <xsl:value-of select="252
+	    - 4 * string-length(content-text)"/>, 255);
+	  </xsl:attribute>
+	</xsl:if>
 
 	<xsl:apply-templates select="header"/>
 	<xsl:apply-templates select="footer"/>