diff --git a/image/head.png b/image/head.png
deleted file mode 100644
index 21749fff..00000000
Binary files a/image/head.png and /dev/null differ
diff --git a/image/head.webp b/image/head.webp
new file mode 100644
index 00000000..fdad194f
Binary files /dev/null and b/image/head.webp differ
diff --git a/image/map.png b/image/map.png
deleted file mode 100644
index 56873bf8..00000000
Binary files a/image/map.png and /dev/null differ
diff --git a/image/map.webp b/image/map.webp
new file mode 100644
index 00000000..587939da
Binary files /dev/null and b/image/map.webp differ
diff --git a/styles-5.0.css b/styles-5.0.css
index 2e8157aa..1a006fcc 100644
--- a/styles-5.0.css
+++ b/styles-5.0.css
@@ -71,7 +71,7 @@ body {
 }
 
 .background {
-	background-image: url("image/head.png");
+	background-image: url("image/head.webp");
 	background-repeat: no-repeat;
 	background-position: center top;
 	background-attachment: fixed;
@@ -210,7 +210,7 @@ b {
 }
 
 #map {
-	background-image: url("image/map.png");
+	background-image: url("image/map.webp");
 }
 
 #sponsor {