diff --git a/book/style.css b/book/style.css
index cc3f9c6..261292e 100644
--- a/book/style.css
+++ b/book/style.css
@@ -589,4 +589,8 @@ blockquote {
     background-color: var(--c-black-background);
     padding: 5px;
   }
+  .mobile-banner a img {
+    border: none;
+    border-radius: 0px;
+  }
 }
diff --git a/website/modify_build.rb b/website/modify_build.rb
index 8fef8b8..f93222c 100644
--- a/website/modify_build.rb
+++ b/website/modify_build.rb
@@ -392,7 +392,7 @@ class ModifyBuild
 
   def build_header_html
     %Q{
-      <div class="header"><img src="banner.png"></div>
+      <div class="header"><a href="/"><img src="banner.png"></a></div>
     }
   end
 
@@ -782,7 +782,7 @@ class ModifyBuild
   def insert_mobile_header_graphic(text)
     doc = build_doc(text)
     content = doc.css(".TOC.menu")[0]
-    content.after('<div class="mobile-banner"><img src="banner.png" /></div>')
+    content.after('<div class="mobile-banner"><a href="/"><img src="banner.png" /></a></div>')
     doc.to_html
   end