Corrected some validation issues in the CSS code.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@3685 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

stylesheets/lfs.css

@@ -34,11 +34,11 @@ h5, h6 { font-size: 110%; font-style: italic; }
 
 /* Navigation */
 div.headertitles h4 {
-  margin-bottom: 0px auto;
+  margin-bottom: 0px;
 }
 
 div.headertitles h3 {
-  margin-top: 0px auto;
+  margin-top: 0px;
 }
 
 div.navheader, div.navfooter {
@@ -168,7 +168,7 @@ div.segmentedlist p {
 }
 
 dl.materials dd {
-  margin-left: 0px auto;
+  margin-left: 0px;
 }
 
 /* Indented blocks */
@@ -242,4 +242,4 @@ hr {
   height: .3em;
   border: 0px;
   margin: 0px auto;
-}
+}