diff --git a/README.md b/README.md
index da8c5c8a..37e03149 100644
--- a/README.md
+++ b/README.md
@@ -35,5 +35,5 @@ Background pattern from http://subtlepatterns.com/, commercial and non-commercia
 ### Mobile screenshots
 
 <p align="center">
-  <img src="web-mob-contacts-1.png" alt="Mobile web: contacts" width=323 /> <img src="web-mob-chat-1.png" alt="Mobile web: chat" width=323 /> <img src="web-mob-info-1.png" alt="Mobile web: topic info" width=323 /> <img src="web-mob-new-chat-1.png" alt="Mobile web: start new chat" width=323 />
+  <img src="web-mob-contacts-1.png" alt="Mobile web: contacts" width=323 style="border: 1px solid gray" /> <img src="web-mob-chat-1.png" alt="Mobile web: chat" width=323 style="border: 1px solid gray" /> <img src="web-mob-info-1.png" alt="Mobile web: topic info" width=323 style="border: 1px solid gray" /> <img src="web-mob-new-chat-1.png" alt="Mobile web: start new chat" width=323 style="border: 1px solid gray" />
 </p>