diff --git a/web_tool/css/main.css b/web_tool/css/main.css
index 9116988..14bc95f 100644
--- a/web_tool/css/main.css
+++ b/web_tool/css/main.css
@@ -47,6 +47,7 @@ body {
     width: 125px;
     height: 125px;
     margin: 10px;
+    border: 2px solid transparent;
 }
 
 .exampleImage.active{