diff --git a/stylesheets/style.css b/stylesheets/style.css
index e02fe0f4..42557440 100644
--- a/stylesheets/style.css
+++ b/stylesheets/style.css
@@ -1205,6 +1205,14 @@ span.pln {
     min-width:  48px;
 }
 
+/* The center tag has been deprecated in HTML 5 */
+.center {
+    display: block;
+    margin-left: auto;
+    margin-right: auto;
+    text-align: center;
+}
+
 /* Text and accessibility */
 .ltr {
     direction: ltr;
@@ -1980,4 +1988,3 @@ span.orangeQuote {
   float:   right;
   margin:  0em 1em;
 }
-