diff --git a/main.js b/main.js
index 1091eaf..9372ea9 100644
--- a/main.js
+++ b/main.js
@@ -579,6 +579,11 @@
       cursor: zoom-in;
     }
 
+    dialog .preview {
+      max-width: 1000px;
+      max-height: 600px;
+    }
+
     button.button-delete {
       padding: 0;
       border: 0;