diff --git a/www/images/collapse.gif b/www/images/collapse.gif
deleted file mode 100644
index 01e691450c48..000000000000
Binary files a/www/images/collapse.gif and /dev/null differ
diff --git a/www/images/collapse.png b/www/images/collapse.png
new file mode 100644
index 000000000000..6a2cc76ba8f5
Binary files /dev/null and b/www/images/collapse.png differ
diff --git a/www/images/expand.gif b/www/images/expand.gif
deleted file mode 100644
index 1b24ef1248de..000000000000
Binary files a/www/images/expand.gif and /dev/null differ
diff --git a/www/images/expand.png b/www/images/expand.png
new file mode 100644
index 000000000000..15ff4bc338f9
Binary files /dev/null and b/www/images/expand.png differ
diff --git a/www/yb.css b/www/yb.css
index 7ab653cd89a5..2b17d94d1e95 100644
--- a/www/yb.css
+++ b/www/yb.css
@@ -224,10 +224,10 @@ body {
 }
 
 .collapse .toggle {
-  background: url("/images/collapse.gif");
+  background: url("images/collapse.png");
 }
 .expand .toggle {
-  background: url("/images/expand.gif");
+  background: url("images/expand.png");
 }
 .toggle {
   height: 9px;