Backport CSS updates

fredericDelaporte · hazzik · commit 14c989f5ae03 · 2017-10-31T16:20:02.000+13:00
diff --git a/doc/reference/styles/html.css b/doc/reference/styles/html.css
@@ -92,6 +92,9 @@ HR  {
     font-weight:bold;
 }
 
-
-
-    
+.book > DIV, .chapter, .preface {
+    max-width: 50em;
+    margin-left: auto;
+    margin-right: auto;
+    font-size: large;
+}
