diff --git a/src/main/java/org/gcube/portlets/user/shareupdates/client/view/AttachmentPreviewer.ui.xml b/src/main/java/org/gcube/portlets/user/shareupdates/client/view/AttachmentPreviewer.ui.xml
index 46fd3d6..5b50dac 100644
--- a/src/main/java/org/gcube/portlets/user/shareupdates/client/view/AttachmentPreviewer.ui.xml
+++ b/src/main/java/org/gcube/portlets/user/shareupdates/client/view/AttachmentPreviewer.ui.xml
@@ -7,7 +7,8 @@
 		margin: 5px;
 		display: inline;
 		height: 40px;
-		width: auto;
+		width: 40px;
+		overflow: hidden;
 		float: left;
 	}