diff --git a/admin/themes/default/theme.css b/admin/themes/default/theme.css
index c55bcf909..61e268fa5 100644
--- a/admin/themes/default/theme.css
+++ b/admin/themes/default/theme.css
@@ -4420,6 +4420,7 @@ a.group_users {
 .preview-box.icon-zoom-in {
   display:block;
   position:relative;
+  max-width: 150px;
 }
 
 .preview-box.icon-zoom-in:before {