--- a/toolkit/themes/shared/aboutReader.css
+++ b/toolkit/themes/shared/aboutReader.css
@@ -49,52 +49,52 @@ body.sans-serif .remove-button {
   font-family: Helvetica, Arial, sans-serif;
 }
 
 body.serif,
 body.serif .remove-button  {
   font-family: Georgia, "Times New Roman", serif;
 }
 
-body.font-size1 {
-  font-size: 10px;
-}
-
-body.font-size2 {
+#container.font-size1 {
   font-size: 12px;
 }
 
-body.font-size3 {
+#container.font-size2 {
   font-size: 14px;
 }
 
-body.font-size4  {
+#container.font-size3 {
   font-size: 16px;
 }
 
-body.font-size5 {
+#container.font-size4  {
   font-size: 18px;
 }
 
-body.font-size6 {
+#container.font-size5 {
   font-size: 20px;
 }
 
-body.font-size7 {
+#container.font-size6 {
   font-size: 22px;
 }
 
-body.font-size8 {
+#container.font-size7 {
   font-size: 24px;
 }
 
-body.font-size9 {
+#container.font-size8 {
   font-size: 26px;
 }
 
+#container.font-size9 {
+  font-size: 28px;
+}
+
 /* Override some controls and content styles based on color scheme */
 
 body.light > .container > .header > .domain,
 body.sepia > .container > .header > .domain {
   border-bottom-color: #333333 !important;
 }
 
 body.dark > .container > .header > .domain {