diff --git a/file_viewer_styles.css b/file_viewer_styles.css
index dd63e95..303fc52 100644
--- a/file_viewer_styles.css
+++ b/file_viewer_styles.css
@@ -19,4 +19,5 @@
     margin: 16px;
     cursor: pointer;
     border-radius: 16px 16px 0px 0px;
+    border: 2px solid rgba(255, 255, 255, 0.3);
 }
\ No newline at end of file