diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e631f7e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+task.md
+/.wrangler
\ No newline at end of file
diff --git a/grid-study/src/wallpaper/big_sure.jpg b/grid-study/src/wallpaper/big_sure.jpg
deleted file mode 100644
index 6d29104..0000000
Binary files a/grid-study/src/wallpaper/big_sure.jpg and /dev/null differ
diff --git a/grid-study/src/wallpaper/big_sure.webp b/grid-study/src/wallpaper/big_sure.webp
new file mode 100644
index 0000000..9f1c3f7
Binary files /dev/null and b/grid-study/src/wallpaper/big_sure.webp differ
diff --git a/grid-study/src/wallpaper/desert.jpg b/grid-study/src/wallpaper/desert.jpg
deleted file mode 100644
index d6f796f..0000000
Binary files a/grid-study/src/wallpaper/desert.jpg and /dev/null differ
diff --git a/grid-study/src/wallpaper/desert.webp b/grid-study/src/wallpaper/desert.webp
new file mode 100644
index 0000000..8442450
Binary files /dev/null and b/grid-study/src/wallpaper/desert.webp differ
diff --git a/grid-study/styles.css b/grid-study/styles.css
index cc70ebc..2ba6feb 100644
--- a/grid-study/styles.css
+++ b/grid-study/styles.css
@@ -1,7 +1,7 @@
 html, body { height: 100%; }
 body {
     /* 使用 Bing 图片作为背景 */
-    background-image: url('src/wallpaper/big_sure.jpg');
+    background-image: url('src/wallpaper/big_sure.webp');
     background-size: cover;
     background-position: center;
     background-repeat: no-repeat;