diff --git a/README.md b/README.md
index 531e3ca..dba2add 100644
--- a/README.md
+++ b/README.md
@@ -168,6 +168,6 @@ PC program source files are located under `./software/pc/`. The compiled program
 
 ### Android
 
-<img src="./imgs/screenshot_connect.png" alt="screenshot_connect" width="500"/>
+<img src="./imgs/screenshot_connect.png" alt="screenshot_connect" width="400"/>
 
-<img src="./imgs/screenshot_control.png" alt="screenshot_control" width="500"/>
+<img src="./imgs/screenshot_control.png" alt="screenshot_control" width="750"/>