diff --git a/www/data/background.avif b/www/data/background.avif
new file mode 100644
index 0000000..d6c53e2
Binary files /dev/null and b/www/data/background.avif differ
diff --git a/www/data/background.webp b/www/data/background.webp
deleted file mode 100644
index b42b10c..0000000
Binary files a/www/data/background.webp and /dev/null differ
diff --git a/www/index.html b/www/index.html
index 5f7f258..104b15a 100644
--- a/www/index.html
+++ b/www/index.html
@@ -10,7 +10,7 @@
       <link rel="stylesheet" href="./css/custom.css">
       <style>
         body {
-          background-image: url('./data/background.webp');
+          background-image: url('./data/background.avif');
           background-repeat: no-repeat;
           background-attachment: fixed;
           background-size: cover;