diff --git a/_assets/group.jpg b/_assets/group.jpg
index cad5ded..502d300 100644
Binary files a/_assets/group.jpg and b/_assets/group.jpg differ
diff --git a/index.md b/index.md
index b1a3954..e1b8d3f 100644
--- a/index.md
+++ b/index.md
@@ -16,5 +16,5 @@ We are recruiting PhD students and research assistants, please write an email to
 
 Join [HKUST-GZ Zulip](http://zulip.hkust-gz.edu.cn/) for discussion. To get an invitation, please write an email to my email address above.
 
-![Photo](/assets/group.jpg)
+[![Photo](/assets/group.jpg)](/assets/group.jpg)